Date post: | 21-Jan-2016 |
Category: |
Documents |
Upload: | katrina-glenn |
View: | 246 times |
Download: | 0 times |
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
2211
WARM UPWARM UP
1)5.15 x 101)5.15 x 1055 = 515,000 = 515,000
2) 3.14 x 7 = 21.982) 3.14 x 7 = 21.98
3)0.007 x 6 = 0.0423)0.007 x 6 = 0.042
4)99.99 x 3 = 299.974)99.99 x 3 = 299.97
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
3311
Multiplying Decimals By DecimalsMultiplying Decimals By Decimals
When multiplying a decimal by a decimal, multiply as with whole numbers.
To place the decimal point, find the sum of the number of decimal places in each factor.
The product has the same number of decimal places.
Let’s begin today
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
4411
Multiplying DecimalsMultiplying Decimals
For example: Find 4.2 x 6.7For example: Find 4.2 x 6.7
4.24.2x 6.7x 6.7 294294
252252 28.1428.14
One decimal place
One decimal place
Two decimal places
The product is 28.14. Compared to the estimate, the product is reasonable.
Estimate 4.2 x 6.7 ->4x7 or 28
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
5511
Multiplying Decimals By DecimalsMultiplying Decimals By Decimals
Find 1.6 x 0.09 =Find 1.6 x 0.09 =
1.6
x0.09
0.144
One decimal place
Two decimal place
Three decimal place
Let’s practice
The product is 0.144. Compared to the estimate, the product is reasonable.
Estimate: 1.6 x 0.09= 2 x 0=0
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
6611
Multiplying DecimalsMultiplying Decimals
Your turn! Multiply 0.014 x 3.7Your turn! Multiply 0.014 x 3.7
0.014
x 3.7
0.0518
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
7711
Multiply:-
1) 5.7 x 2.8 =15.96 2) 4.12 x 0.07=0.2884
3) 0.12 x 5.3 =0.636
Practice Problems
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
8811
Tea BreakTea Break
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
9911
Try to solveTry to solve
http://www.thekidzpage.com/onlinejigsawpuzzles/kids-jigsaw-puzzles/12-piece-jigsaw/07-01-06-fworks3.html
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
101011
Let’s check what you understandLet’s check what you understand
Now, try to answer.Now, try to answer.
What is the number of decimal places in What is the number of decimal places in the product of 5.974 x 3.21 ?the product of 5.974 x 3.21 ?
The number of decimal places in the product is 5
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
111111
AssessmentAssessment
2) 0.7 x 2.5 =1.75
1) 1.5 x 0.7 =1.05
3) 0.8 x 2.4 =1.92
4) 9.4 x 0.7 =6.58
5) 0.8 x 0.4 =0.32
6) 0.24 x 0.4 =0.096
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
121211
AssessmentAssessment
9) 2.6b, if b=2.05
7) 1.4x, if x = 0.067 8) 0.04t, If t =3.2
10) 1.33c, if c =0.06
0.0938 0.128
5.33 0.0798
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
131311
Life Situation ProblemsLife Situation Problems11) Juan is buying a video game that 11) Juan is buying a video game that costs $32.99. The Sales Tax is found costs $32.99. The Sales Tax is found by multiplying the cost of the video by multiplying the cost of the video game by 0.06. What is the cost of the game by 0.06. What is the cost of the sales tax for the video game?sales tax for the video game?
Cost of the Sales tax for the video Cost of the Sales tax for the video game = $ 32.99 x 0.06 game = $ 32.99 x 0.06
= $ 1.9794 =$ 1.98= $ 1.9794 =$ 1.98
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
141411
Let’s recall what we studied todayLet’s recall what we studied today
When multiplying a decimal When multiplying a decimal by a decimal, multiply as with by a decimal, multiply as with whole numbers. To place the whole numbers. To place the decimal point, find the sum of decimal point, find the sum of the number of decimal places the number of decimal places in each factor. The product has in each factor. The product has the same number of decimal the same number of decimal places.places.
CONFIDENTIALCONFIDENTIALDecimal Decimal MultiplicationMultiplication
151511
Wow! We studied a lot.
That’s all for today
Bye.