Free Math Worksheets from Classroom Professor Not for resale. May be freely duplicated for classroom use. www.classroomprofessor.com Free Math Worksheets #65 Date: July 15 – 19, 2013 Topic: Doubling Large Numbers Support page: http://freemathworksheets.classroomprofessor.com/doubling-large-numbers/ How to Use These Worksheets: Watch the accompanying video on the support page via the link above. These worksheets are offered freely to teachers of mathematics for use with their own students. See the attached Copyright Notice for details of conditions of use. Receive a weekly email with worksheets like these: Go to http://freemathworksheets.classroomprofessor.com for instructions. If you like these worksheets, check out eBooks containing full versions of these and many other worksheets at store.classroomprofessor.com Share the worksheets with friends via email or social media
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Free Math Worksheets from Classroom Professor
Not for resale. May be freely duplicated for classroom use. www.classroomprofessor.com
Free Math Worksheets
#65 Date: July 15 – 19, 2013
Topic: Doubling Large Numbers
Support page: http://freemathworksheets.classroomprofessor.com/doubling-large-numbers/
How to Use These Worksheets:
Watch the accompanying video on the support page via the link above.
These worksheets are offered freely to teachers of mathematics for use with their own
students. See the attached Copyright Notice for details of conditions of use.
Receive a weekly email with worksheets like these: Go to
http://freemathworksheets.classroomprofessor.com for instructions.
If you like these worksheets, check out eBooks containing full versions of these and many other
worksheets at store.classroomprofessor.com
Share the worksheets with friends via email or social media
Not for resale. May be freely duplicated for classroom use. www.classroomprofessor.com
Duplication License
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Licensed for unlimited copying by original purchaser only. www.classroomprofessor.com
Doubling 2-digit numbersDouble both places, starting with the tens.For example, Double 23: double the 2 (tens), double the 3: 4 tens + 6 = 46.
Doubling without regrouping
1) 42 × 2 = 84 6) 32 × 2 = 64
2) 34 × 2 = 68 7) 14 × 2 = 28
3) 41 × 2 = 82 8) 20 × 2 = 40
4) 24 × 2 = 48 9) 43 × 2 = 86
5) 31 × 2 = 62 10) 22 × 2 = 44
11) 22 × 2 = 44 16) 32 × 2 = 64
12) 23 × 2 = 46 17) 24 × 2 = 48
13) 13 × 2 = 26 18) 12 × 2 = 24
14) 21 × 2 = 42 19) 40 × 2 = 80
15) 34 × 2 = 68 20) 30 × 2 = 60
Doubling 2-digit numbers with regroupingStart by doubling the tens. For example, Double 46: double 4 = 8. Try to remember this number. If you need to, you canwrite the 8 very lightly until you have doubled the ones.” Now double the ones: double 6 = 12. Add the ten to the 8 tens, write “9” (if you wrote “8” softly, write over it with “9”). Thenrecord the remaining ones, “2”. Double 46 = 92.
Doubling with regrouping
21) 17 × 2 = 34 26) 24 × 2 = 48
22) 39 × 2 = 78 27) 38 × 2 = 76
23) 26 × 2 = 52 28) 12 × 2 = 24
24) 21 × 2 = 42 29) 14 × 2 = 28
25) 27 × 2 = 54 30) 28 × 2 = 56
31) 16 × 2 = 32 36) 21 × 2 = 42
32) 10 × 2 = 20 37) 17 × 2 = 34
33) 20 × 2 = 40 38) 13 × 2 = 26
34) 42 × 2 = 84 39) 34 × 2 = 68
35) 46 × 2 = 92 40) 43 × 2 = 86
x10, x100 or x1000, including decimals
41) 6.3 × 1,000 =
42) 39.5 × 10 =
43) 102 × 10 =
44) 949 × 100 =
45) 497 × 100 =
46) 64.0 × 10 =
47) 126 × 1,000 =
48) 46.1 × 100 =
49) 878 × 1,000 =
50) 7.2 × 10 =
This worksheet is part of the Classroom Professor eBook "Bring It On! Mental Strategies Worksheets". The recommended teaching sequence isshown in the bar at the top of this sheet.
Mental Strategies Bring It On!
Name: Doubling 2-digit Numbers: 3 [ B ]
Licensed for unlimited copying by original purchaser only. www.classroomprofessor.com
Doubling 2-digit numbersDouble both places, starting with the tens.For example, Double 23: double the 2 (tens), double the 3: 4 tens + 6 = 46.
Doubling without regrouping
1) 24 × 2 = 48 6) 44 × 2 = 88
2) 54 × 2 = 108 7) 72 × 2 = 144
3) 73 × 2 = 146 8) 42 × 2 = 84
4) 71 × 2 = 142 9) 91 × 2 = 182
5) 12 × 2 = 24 10) 63 × 2 = 126
11) 13 × 2 = 26 16) 83 × 2 = 166
12) 54 × 2 = 108 17) 30 × 2 = 60
13) 20 × 2 = 40 18) 32 × 2 = 64
14) 50 × 2 = 100 19) 93 × 2 = 186
15) 81 × 2 = 162 20) 64 × 2 = 128
Doubling 2-digit numbers with regroupingStart by doubling the tens. For example, Double 46: double 4 = 8. Try to remember this number. If you need to, you canwrite the 8 very lightly until you have doubled the ones.” Now double the ones: double 6 = 12. Add the ten to the 8 tens, write “9” (if you wrote “8” softly, write over it with “9”). Thenrecord the remaining ones, “2”. Double 46 = 92.
Doubling with regrouping
21) 46 × 2 = 92 26) 72 × 2 = 144
22) 87 × 2 = 174 27) 67 × 2 = 134
23) 68 × 2 = 136 28) 46 × 2 = 92
24) 38 × 2 = 76 29) 19 × 2 = 38
25) 75 × 2 = 150 30) 87 × 2 = 174
31) 62 × 2 = 124 36) 25 × 2 = 50
32) 98 × 2 = 196 37) 47 × 2 = 94
33) 54 × 2 = 108 38) 75 × 2 = 150
34) 49 × 2 = 98 39) 38 × 2 = 76
35) 26 × 2 = 52 40) 97 × 2 = 194
x10, x100 or x1000, including decimals
41) 6.3 × 1,000 =
42) 39.5 × 10 =
43) 102 × 10 =
44) 949 × 100 =
45) 497 × 100 =
46) 64.0 × 10 =
47) 126 × 1,000 =
48) 46.1 × 100 =
49) 878 × 1,000 =
50) 7.2 × 10 =
This worksheet is part of the Classroom Professor eBook "Bring It On! Mental Strategies Worksheets". The recommended teaching sequence isshown in the bar at the top of this sheet.
Mental Strategies Bring It On!
Name: Doubling 3-digit Numbers: 3 [ C ]
Licensed for unlimited copying by original purchaser only. www.classroomprofessor.com
Doubling 3-digit numbersDouble each place in turn, starting with hundreds, then tens and ones.For example, Double 431: double 4 (hundreds) + double 3 (tens) + double 1 (one) = 8 hundreds + 6 tens + 2 ones = 862.
Doubling without regrouping
1) 242 × 2 = 484 6) 122 × 2 = 244
2) 434 × 2 = 868 7) 414 × 2 = 828
3) 411 × 2 = 822 8) 220 × 2 = 440
4) 234 × 2 = 468 9) 403 × 2 = 806
5) 341 × 2 = 682 10) 212 × 2 = 424
11) 422 × 2 = 844 16) 312 × 2 = 624
12) 203 × 2 = 406 17) 124 × 2 = 248
13) 343 × 2 = 686 18) 243 × 2 = 486
14) 241 × 2 = 482 19) 240 × 2 = 480
15) 304 × 2 = 608 20) 330 × 2 = 660
Doubling 3-digit numbers with regroupingStart with the hundreds, then double the tens and the ones. If regrouping is required, try to remember that the extra one isneeded without writing it down. If needed, each digit can be written lightly, so that if regrouping is needed, the digit can beoverwritten with the new value, as on worksheet 3[A]. Some of these questions will require extra time to reach the answer.
Doubling with regrouping
21) 146 × 2 = 292 26) 322 × 2 = 644
22) 437 × 2 = 874 27) 435 × 2 = 870
23) 248 × 2 = 496 28) 616 × 2 = 1,232
24) 138 × 2 = 276 29) 219 × 2 = 438
25) 225 × 2 = 450 30) 427 × 2 = 854
31) 522 × 2 = 1,044 36) 831 × 2 = 1,662
32) 418 × 2 = 836 37) 247 × 2 = 494
33) 634 × 2 = 1,268 38) 835 × 2 = 1,670
34) 349 × 2 = 698 39) 630 × 2 = 1,260
35) 723 × 2 = 1,446 40) 207 × 2 = 414
Multiplication
41) 5 5× = 46) 8 6× =
42) 8 9× = 47) 9 9× =
43) 10 7× = 48) 8 5× =
44) 9 4× = 49) 6 6× =
45) 6 9× = 50) 10 6× =
Division
51) 32 4÷ = 56) 40 4÷ =
52) 16 4÷ = 57) 90 9÷ =
53) 64 8÷ = 58) 24 6÷ =
54) 70 7÷ = 59) 36 9÷ =
55) 48 8÷ = 60) 28 7÷ =
This worksheet is part of the Classroom Professor eBook "Bring It On! Mental Strategies Worksheets". The recommended teaching sequence isshown in the bar at the top of this sheet.
Mental Strategies Bring It On!
Name: Doubling 3-digit Numbers: 3 [ D ]
Licensed for unlimited copying by original purchaser only. www.classroomprofessor.com
Doubling 3-digit numbers with regroupingStart with the hundreds, then the tens and the ones.Write digits lightly as you double them if you cannot remember them all.
This worksheet is part of the Classroom Professor eBook "Bring It On! Mental Strategies Worksheets". The recommended teaching sequence isshown in the bar at the top of this sheet.
Mental Strategies Bring It On!
Homework Doubling 2-digit Numbers: 3 [ A ]
Licensed for unlimited copying by original purchaser only. www.classroomprofessor.com
Information for Parents: Doubling 2-digit Numbers
Doubling 2-digit numbersDouble both places, starting with the tens.For example, Double 23: double the 2 (tens), double the 3: 4 tens + 6 = 46.
Doubling without regrouping
1) 10 × 2 = 20 6) 21 × 2 = 42
2) 32 × 2 = 64 7) 7 × 2 = 14
3) 11 × 2 = 22 8) 23 × 2 = 46
4) 34 × 2 = 68 9) 44 × 2 = 88
5) 13 × 2 = 26 10) 40 × 2 = 80
11) 41 × 2 = 82 16) 1 × 2 = 2
12) 43 × 2 = 86 17) 23 × 2 = 46
13) 22 × 2 = 44 18) 12 × 2 = 24
14) 24 × 2 = 48 19) 41 × 2 = 82
15) 11 × 2 = 22 20) 30 × 2 = 60
Doubling 2-digit numbers with regroupingStart by doubling the tens. For example, Double 46: double 4 = 8. Try to remember this number. If you need to, you canwrite the 8 very lightly until you have doubled the ones.” Now double the ones: double 6 = 12. Add the ten to the 8 tens, write “9” (if you wrote “8” softly, write over it with “9”). Thenrecord the remaining ones, “2”. Double 46 = 92.
Doubling with regrouping
21) 17 × 2 = 34 26) 24 × 2 = 48
22) 39 × 2 = 78 27) 38 × 2 = 76
23) 26 × 2 = 52 28) 18 × 2 = 36
24) 21 × 2 = 42 29) 14 × 2 = 28
25) 27 × 2 = 54 30) 28 × 2 = 56
31) 16 × 2 = 32 36) 21 × 2 = 42
32) 10 × 2 = 20 37) 17 × 2 = 34
33) 20 × 2 = 40 38) 13 × 2 = 26
34) 42 × 2 = 84 39) 34 × 2 = 68
35) 46 × 2 = 92 40) 43 × 2 = 86
x10, x100 or x1000, including decimals
41) 6.3 × 1,000 =
42) 39.5 × 10 =
43) 102 × 10 =
44) 949 × 100 =
45) 497 × 100 =
46) 64.0 × 10 =
47) 126 × 1,000 =
48) 46.1 × 100 =
49) 878 × 1,000 =
50) 7.2 × 10 =
This worksheet is part of the Classroom Professor eBook “Bring It On! Mental Strategies Worksheets”.
Mental Strategies Bring It On!
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Doubling 2-digit numbersDouble both places, starting with the tens.For example, Double 23: double the 2 (tens), double the 3: 4 tens + 6 = 46.
Doubling without regrouping
1) 42 × 2 = 84 6) 32 × 2 = 64
2) 34 × 2 = 68 7) 14 × 2 = 28
3) 41 × 2 = 82 8) 20 × 2 = 40
4) 24 × 2 = 48 9) 43 × 2 = 86
5) 31 × 2 = 62 10) 22 × 2 = 44
11) 22 × 2 = 44 16) 32 × 2 = 64
12) 23 × 2 = 46 17) 24 × 2 = 48
13) 13 × 2 = 26 18) 12 × 2 = 24
14) 21 × 2 = 42 19) 40 × 2 = 80
15) 34 × 2 = 68 20) 30 × 2 = 60
Doubling 2-digit numbers with regroupingStart by doubling the tens. For example, Double 46: double 4 = 8. Try to remember this number. If you need to, you canwrite the 8 very lightly until you have doubled the ones.” Now double the ones: double 6 = 12. Add the ten to the 8 tens, write “9” (if you wrote “8” softly, write over it with “9”). Thenrecord the remaining ones, “2”. Double 46 = 92.
Doubling with regrouping
21) 17 × 2 = 34 26) 24 × 2 = 48
22) 39 × 2 = 78 27) 38 × 2 = 76
23) 26 × 2 = 52 28) 12 × 2 = 24
24) 21 × 2 = 42 29) 14 × 2 = 28
25) 27 × 2 = 54 30) 28 × 2 = 56
31) 16 × 2 = 32 36) 21 × 2 = 42
32) 10 × 2 = 20 37) 17 × 2 = 34
33) 20 × 2 = 40 38) 13 × 2 = 26
34) 42 × 2 = 84 39) 34 × 2 = 68
35) 46 × 2 = 92 40) 43 × 2 = 86
x10, x100 or x1000, including decimals
41) 6.3 × 1,000 = 6,300.0
42) 39.5 × 10 = 395.0
43) 102 × 10 = 1,020
44) 949 × 100 = 94,900
45) 497 × 100 = 49,700
46) 64.0 × 10 = 640.0
47) 126 × 1,000 = 126,000
48) 46.1 × 100 = 4,610.0
49) 878 × 1,000 = 878,000
50) 7.2 × 10 = 72.0
This worksheet is part of the Classroom Professor eBook "Bring It On! Mental Strategies Worksheets". The recommended teaching sequence isshown in the bar at the top of this sheet.
ANSWERS Mental Strategies Bring It On!
Name: Doubling 2-digit Numbers: 3 [ B ]
Licensed for unlimited copying by original purchaser only. www.classroomprofessor.com
Doubling 2-digit numbersDouble both places, starting with the tens.For example, Double 23: double the 2 (tens), double the 3: 4 tens + 6 = 46.
Doubling without regrouping
1) 24 × 2 = 48 6) 44 × 2 = 88
2) 54 × 2 = 108 7) 72 × 2 = 144
3) 73 × 2 = 146 8) 42 × 2 = 84
4) 71 × 2 = 142 9) 91 × 2 = 182
5) 12 × 2 = 24 10) 63 × 2 = 126
11) 13 × 2 = 26 16) 83 × 2 = 166
12) 54 × 2 = 108 17) 30 × 2 = 60
13) 20 × 2 = 40 18) 32 × 2 = 64
14) 50 × 2 = 100 19) 93 × 2 = 186
15) 81 × 2 = 162 20) 64 × 2 = 128
Doubling 2-digit numbers with regroupingStart by doubling the tens. For example, Double 46: double 4 = 8. Try to remember this number. If you need to, you canwrite the 8 very lightly until you have doubled the ones.” Now double the ones: double 6 = 12. Add the ten to the 8 tens, write “9” (if you wrote “8” softly, write over it with “9”). Thenrecord the remaining ones, “2”. Double 46 = 92.
Doubling with regrouping
21) 46 × 2 = 92 26) 72 × 2 = 144
22) 87 × 2 = 174 27) 67 × 2 = 134
23) 68 × 2 = 136 28) 46 × 2 = 92
24) 38 × 2 = 76 29) 19 × 2 = 38
25) 75 × 2 = 150 30) 87 × 2 = 174
31) 62 × 2 = 124 36) 25 × 2 = 50
32) 98 × 2 = 196 37) 47 × 2 = 94
33) 54 × 2 = 108 38) 75 × 2 = 150
34) 49 × 2 = 98 39) 38 × 2 = 76
35) 26 × 2 = 52 40) 97 × 2 = 194
x10, x100 or x1000, including decimals
41) 6.3 × 1,000 = 6,300.0
42) 39.5 × 10 = 395.0
43) 102 × 10 = 1,020
44) 949 × 100 = 94,900
45) 497 × 100 = 49,700
46) 64.0 × 10 = 640.0
47) 126 × 1,000 = 126,000
48) 46.1 × 100 = 4,610.0
49) 878 × 1,000 = 878,000
50) 7.2 × 10 = 72.0
This worksheet is part of the Classroom Professor eBook "Bring It On! Mental Strategies Worksheets". The recommended teaching sequence isshown in the bar at the top of this sheet.
ANSWERS Mental Strategies Bring It On!
Name: Doubling 3-digit Numbers: 3 [ C ]
Licensed for unlimited copying by original purchaser only. www.classroomprofessor.com
Doubling 3-digit numbersDouble each place in turn, starting with hundreds, then tens and ones.For example, Double 431: double 4 (hundreds) + double 3 (tens) + double 1 (one) = 8 hundreds + 6 tens + 2 ones = 862.
Doubling without regrouping
1) 242 × 2 = 484 6) 122 × 2 = 244
2) 434 × 2 = 868 7) 414 × 2 = 828
3) 411 × 2 = 822 8) 220 × 2 = 440
4) 234 × 2 = 468 9) 403 × 2 = 806
5) 341 × 2 = 682 10) 212 × 2 = 424
11) 422 × 2 = 844 16) 312 × 2 = 624
12) 203 × 2 = 406 17) 124 × 2 = 248
13) 343 × 2 = 686 18) 243 × 2 = 486
14) 241 × 2 = 482 19) 240 × 2 = 480
15) 304 × 2 = 608 20) 330 × 2 = 660
Doubling 3-digit numbers with regroupingStart with the hundreds, then double the tens and the ones. If regrouping is required, try to remember that the extra one isneeded without writing it down. If needed, each digit can be written lightly, so that if regrouping is needed, the digit can beoverwritten with the new value, as on worksheet 3[A]. Some of these questions will require extra time to reach the answer.
Doubling with regrouping
21) 146 × 2 = 292 26) 322 × 2 = 644
22) 437 × 2 = 874 27) 435 × 2 = 870
23) 248 × 2 = 496 28) 616 × 2 = 1,232
24) 138 × 2 = 276 29) 219 × 2 = 438
25) 225 × 2 = 450 30) 427 × 2 = 854
31) 522 × 2 = 1,044 36) 831 × 2 = 1,662
32) 418 × 2 = 836 37) 247 × 2 = 494
33) 634 × 2 = 1,268 38) 835 × 2 = 1,670
34) 349 × 2 = 698 39) 630 × 2 = 1,260
35) 723 × 2 = 1,446 40) 207 × 2 = 414
Multiplication
41) 5 5× = 25 46) 8 6× = 48
42) 8 9× = 72 47) 9 9× = 81
43) 10 7× = 70 48) 8 5× = 40
44) 9 4× = 36 49) 6 6× = 36
45) 6 9× = 54 50) 10 6× = 60
Division
51) 32 4÷ = 8 56) 40 4÷ = 10
52) 16 4÷ = 4 57) 90 9÷ = 10
53) 64 8÷ = 8 58) 24 6÷ = 4
54) 70 7÷ = 10 59) 36 9÷ = 4
55) 48 8÷ = 6 60) 28 7÷ = 4
This worksheet is part of the Classroom Professor eBook "Bring It On! Mental Strategies Worksheets". The recommended teaching sequence isshown in the bar at the top of this sheet.
ANSWERS Mental Strategies Bring It On!
Name: Doubling 3-digit Numbers: 3 [ D ]
Licensed for unlimited copying by original purchaser only. www.classroomprofessor.com
Doubling 3-digit numbers with regroupingStart with the hundreds, then the tens and the ones.Write digits lightly as you double them if you cannot remember them all.
This worksheet is part of the Classroom Professor eBook "Bring It On! Mental Strategies Worksheets". The recommended teaching sequence isshown in the bar at the top of this sheet.
ANSWERS Mental Strategies Bring It On!
Homework Doubling 2-digit Numbers: 3 [ A ]
Licensed for unlimited copying by original purchaser only. www.classroomprofessor.com
Information for Parents: Doubling 2-digit Numbers
Doubling 2-digit numbersDouble both places, starting with the tens.For example, Double 23: double the 2 (tens), double the 3: 4 tens + 6 = 46.
Doubling without regrouping
1) 10 × 2 = 20 6) 21 × 2 = 42
2) 32 × 2 = 64 7) 7 × 2 = 14
3) 11 × 2 = 22 8) 23 × 2 = 46
4) 34 × 2 = 68 9) 44 × 2 = 88
5) 13 × 2 = 26 10) 40 × 2 = 80
11) 41 × 2 = 82 16) 1 × 2 = 2
12) 43 × 2 = 86 17) 23 × 2 = 46
13) 22 × 2 = 44 18) 12 × 2 = 24
14) 24 × 2 = 48 19) 41 × 2 = 82
15) 11 × 2 = 22 20) 30 × 2 = 60
Doubling 2-digit numbers with regroupingStart by doubling the tens. For example, Double 46: double 4 = 8. Try to remember this number. If you need to, you canwrite the 8 very lightly until you have doubled the ones.” Now double the ones: double 6 = 12. Add the ten to the 8 tens, write “9” (if you wrote “8” softly, write over it with “9”). Thenrecord the remaining ones, “2”. Double 46 = 92.
Doubling with regrouping
21) 17 × 2 = 34 26) 24 × 2 = 48
22) 39 × 2 = 78 27) 38 × 2 = 76
23) 26 × 2 = 52 28) 18 × 2 = 36
24) 21 × 2 = 42 29) 14 × 2 = 28
25) 27 × 2 = 54 30) 28 × 2 = 56
31) 16 × 2 = 32 36) 21 × 2 = 42
32) 10 × 2 = 20 37) 17 × 2 = 34
33) 20 × 2 = 40 38) 13 × 2 = 26
34) 42 × 2 = 84 39) 34 × 2 = 68
35) 46 × 2 = 92 40) 43 × 2 = 86
x10, x100 or x1000, including decimals
41) 6.3 × 1,000 = 6,300.0
42) 39.5 × 10 = 395.0
43) 102 × 10 = 1,020
44) 949 × 100 = 94,900
45) 497 × 100 = 49,700
46) 64.0 × 10 = 640.0
47) 126 × 1,000 = 126,000
48) 46.1 × 100 = 4,610.0
49) 878 × 1,000 = 878,000
50) 7.2 × 10 = 72.0
This worksheet is part of the Classroom Professor eBook “Bring It On! Mental Strategies Worksheets”.
![Free Math Worksheets from Classroom Professor Free Math Worksheetsfunlearning123.weebly.com/uploads/9/0/3/2/9032402/adding_2_digit… · Addition with Regouping 2 digit: 1 [ B ] Not](https://static.documents.pub/doc/80x56/5f08a06d7e708231d422f085/free-math-worksheets-from-classroom-professor-free-math-work-addition-with-regouping.jpg)
