to increase a number, say 40 by 20%, you could find:
- 10% = 4
- 20% = 8
- 40 + 8 = 48
non-calculator method
or alternatively, you could:
40 * 1.2 = 48
calculator method
remember when increasing by 5% for example, you must type in 40 * 1.05!
and remember at the end of a question, if the answer is the percentage, don't leave it as the decimal :)
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