We are learning to find percentages of 3 digit numbers.

What does % mean?

per

cent

for every

100

To find 1% of a number ÷ by 100

Find 1% of 225

225 ÷ 100(move all digits 2 places to the right)

225.

1% of 225 =

.2 25

To find 10% of a number ÷ by 10

Find 10% of 376

376 ÷ 10(move all digits 1 place to the right)

376.

10% of 376 =

.37 6

Can we use this informationTo find 11% of a number?

10% + 1% = 11%

Find 11% of 352

352 ÷ 100 =

352. 3.52

352 ÷ 10 =3.52

352. 3 .5 2

35.2

3.5235.2+

27.83

Find 2% of 453

1% of 453

453 ÷ 100 =4.531% x 2 = 2%

4.53x 2

601

9

2 x 3 = 62 x 5 = 10 (carry the 1)2 x 4 = 8 + 1 = 9

The decimal point goes between the 9 and the 0.There are 2 digits after the decimal point in the sumso we need 2 digits after the decimal point in the answer .

2% of 453 =

Use these methods to find

12% of 563Hint: add together

10%, 1% and 1%

56.3 + 5.63 + 5.63 =

16% of 285Hint: add together

10%, 6 x 1%

28.5 + (6 x 2.85) =

Can you find 20% of 621?

Hint: 20% = 10% + 10% or 10% x 2

621 ÷ 10 = 62.1

62.162.1+

62.1x 2

124.2 124.2

20% of 621 = 124.2