WHOLE NUMBERWrite in words : 254 two hundred and fifty-four 132 one hundred and thirty-two 254 132 Thou => two hundred fifty-four thousand one hundred and thirty-two.

Write in numerals Nine hundred fifty-seven thousand and six 9 5 7 0 0 6

thou

=>

957 006

Place value and digit value. Place value chart.Hundredthousands

Tenthousands

thousands

hundreds

tens

ones

3

2

4

5

7

8

3 2 4 5 7 8 Place value Digit value 3 2 4 5 7 8 4 0 0 0 thousands 4000

Rounding off numbers1. 2. 3. 4. Underline the digit involved Replace the other digits on its right with zero. Retain all the digits on its left. Look at the first to the right of the place value involved. If the digit is less than 5 (0,1,2,3,4) retain the digit. If the digit is 5 or more (5,6,7,8,9) add 1 to the digit.

Rounding off numbers. - Use place value chart.Hundred thousand s Ten thousand s thousand s hundreds tens ones

9

6

4

0+1

9

Nearest tens

9

6

4

1

0

Nearest hundred

Hundred thousand s

Ten thousand s

thousand s

hundreds

tens

ones

9 9

6 6

4 4

1 0

0 0

H thou

Ten thou 9

Thou 6

H4

tens 1

ones 0

9

6

0

0

0

Nearest thousand

Basic operation addition7+

6 7 4

8 1 0

5 8 3

7 7

2 3

3 1

: 7685 + 723718 1. Write in vertical form. 2. Same place value. 3. Do the calculation use number line 1-18.

76120 9282 = 668386 15 10 11 10

7-

6 9 6

1 2 8

2 8 3

0 2 8

subtraction

6

1

2

3

4

5

6

7

8

9

10

11 12 13 14 15 16 17 18

Multiplication Using lattice style 45 123 x 7 = 315 861 4 3 5 1 2 3 2 1 1 7 1 2 3 4 5 6 7 8 9 7 14 21 28 35 42 49 56 63

2+1 3 0 1 8 5 7 4 1 5 8 6

645 X 17 = 10 9656 0 4 0 0 5

14 0

62 2

48

+1

1

55 7

3

9

6

5

Multiplied by 10, 100, 1000

1324 101324 10 132401324 X 100

1324 1000 1324 1000 1324000

1324 X 100 132400

Division1 2 3 4 5 6 7 8 9 4 8 12 16 20 24 28 32 36

1048 4 = 2622624

1 048 824 24 8 8 0

Divided by ten 6 277 10 = 6 277 10 627 remainder 7 627 7

Divided by 100 6 277 10 0 =

6277 100

62 remainder 77 62.77

Divided by 1000 6 277 10 00 =

6 277 1 000

6 remainder 277 6.277

DECIMAL - Place value and digit value - use place value chart 30 26Tens ones d. p tenths hundredths

3

0

2 tenths 0.2

6

Digit 2 Place value Digit value

Addition and subtraction 1. 23 + 5.382+ 2

35 8

.. .

03 3

08 8

Rounding off decimal numbers Nearest tenths ( 1 decimal place) 4 . 312 4.3 Nearest hundredths ( 2 decimal places) 4.312 4.31

FRACTIONS Equivalent fraction - multiplied denominator and numerator by the same number. 2 = 4 6 8 10 12 14 16 18 20 3 4 5 6 7 8 9 10

1 2

Simplest form - divided numerator and denominator by the same number

4 6

2 2

=

2 3

PERCENTAGE -Calculate 18 % of 25018 100

x

250 = 45

= 45010

averageFind the average 3 , 18 and 66 3 + 18 + 66 = 3 Total of quantity divided by number of quantity

CONVERSION OF UNITS Length Kmx1000 x 100 x 10

m

cm

mm

1000

100

10

Km

m

cm

mm

Mass Kg

x 1000

g

1000

Kg

g

Volume of Liquid x1000

l

l1000

ml

ml

1. 2 6 Kg + 725 g =

+

kg 2 0 3

. 67 3-

g 0 2 2

0 5 5

3.325 kg 3325 g 3 Kg 325g

-

1 km 7 8 1 6

3 5 7

12

1000 m 17 7 8 9

0 0 0

6.790 km 6790 m 6 km 790m

22 cm + 4 m1 = 100m 0 4 4 cm 2 2 0 0 2 2

+

4m

22 cm

4 . 22 m422 cm

PERIMETER8 cm 5 cm 4 cm 6 6 cm

Perimeter = 8 cm + 6 cm + 8 cm + 5 cm + 4 cm + 5 cm + 2 cm = 38 cm

AREA3 cm

5 cmArea = length x breadth = 3 cm x 5 cm2

= 15 cm

VOLUME3 cm volume = l x b x h = 3cm x 5cm x 3cm3

= 45 cm

5 cm3 cm