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6 Cards in this Set
- Front
- Back
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Decrease a quantity (900Kg) by a percentage (35%).
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Decrease 900kg by 35%.
After taking away 35% there will be 65% left. 65% as a decimal is 0.65 so 0.65 × 900 = 585 The answer is 585kg. |
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Increase a quantity (100Kg ) by a percentage (50%).
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Increase 100kg by 50%
After adding 50% there will be 150% left 150% as a decimal is 1.5 so 1.5 × 100 = 150 The answer is 150kg. |
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Find a percentage (55% ) of a quantity (230km ).
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Find 55% of 230km.
55% as a decimal is 0.55 0.55 × 230 = 126.5 Answer: 50% of 230km is 126.5km |
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How do you find compound interest?
£50 in bank for 3 years at 5.3% per annum. |
A man has £50 in his bank account at the start of the year. The interest rate is 5.3% per annum. If he leaves his money there, how much will the balance be at the end of 3 years?
Answer: Add 5.3% on to 100% = 105.3%. As a decimal this is 1.053. Multiply £50 by 1.053 (3 times due to 3 years) 50 x (1.053)3 = 58.37879385 Money has two decimal places Answer = £58.38. |
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How do you find a percentage from an amount?
Percentage of boys in a class of 14 boys and 11 girls. |
There are 14 boys and 11 girls in a class.
Total in the class = 25 so the fraction of boys is 14/25. 14 ÷ 25 × 100 = 56 So the percentage of boys in the class is 56%. |
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How do you find the original quantity?
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(New value ÷ 100% + % increase) × 100
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