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# Percentages

Percentages. We are learning to find percentages of 3 digit numbers. What does % mean?. per. for every. cent. 100. To find 1% of a number ÷ by 100. Find 1% of 225. 225. 225 ÷ 100. (move all digits 2 places to the right). 2. 2. 5. 1% of 225 =. 2.25.

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## Percentages

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### Presentation Transcript

1. Percentages We are learning to find percentages of 3 digit numbers.

2. What does % mean? per for every cent 100

3. To find 1% of a number ÷ by 100 Find 1% of 225 225. 225 ÷ 100 (move all digits 2 places to the right) . 2 2 5 1% of 225 = 2.25

4. To find 10% of a number ÷ by 10 Find 10% of 376 376. 376 ÷ 10 (move all digits 1 place to the right) 3 7 . 6 10% of 376 = 37.6

5. Can we use this information To find 11% of a number? 10% + 1% = 11%

6. Find 11% of 352 10% 1% 35.2 3.52 352 ÷ 10 = 352 ÷ 100 = 352. 352. . . 3 2 3 2 5 5 3.52 + 35.2 11% of 352= . 7 2 3 8

7. Find 2% of 453 1% of 453 1% x 2 = 2% 453 ÷ 100 = 4.53 4.53 2 x 3 = 6 2 x 5 = 10 (carry the 1) The decimal point goes between the 9 and the 0. There are 2 digits after the decimal point in the sum so we need 2 digits after the decimal point in the answer x 2 1 2 x 4 = 8 + 1 = 9 9 0 6 . 9.06 2% of 453 =

8. Use these methods to find Hint: add together 10%, 1% and 1% 12% of 563 56.3 + 5.63 + 5.63 = 67.56 Hint: add together 10%, 6 x 1% 16% of 285 28.5 + (6 x 2.85) = 45.6

9. Hint: 20% = 10% + 10% or 10% x 2 Can you find 20% of 621? 621 ÷ 10 = 62.1 62.1 62.1 + x 2 62.1 124.2 124.2 20% of 621 = 124.2

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