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💯 Percentages
Finding percentages of numbers fast, and switching between percents, fractions and decimals.
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Tip A quick way to do these in your head
Build from 10%: for 15% of 60, 10% is 6 and 5% is 3, so 15% is 9. For 75%, take half and then half again and add: 75% of 80 = 40 + 20 = 60.