how can you use 10% of a number to find 20% of the number? 30%? Explain your reasoning?
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Answer:
To calculate a percentage of a quantity, we use the same method as when we calculate a fractional part of that quantity because percent simply means a hundredth part. Therefore, percentages are just fractions.
How much is 1% of 200 kg? This means how much is 1/100 of 200 kg?
It is simply 2 kg. You just divide by 100 to find a hundredth part!
To find 1% of something (1/100 of something), divide by 100.
Remember how to divide by 100 mentally: Just move the decimal point two places to the left. For example, 1% of 540 is 5.4. And 1% of 8.30 is 0.083.
To find 10% of some quantity, divide by 10.
Why does that work? 10% is 10/100. And 10/100 is equal to 1/10. So we just find 1/10 of the For example, 10% of 340 people is 34 people. Similarly, 10% of $2.30 is $0.23.
(To divide by 10 mentally, just move the decimal point one place to the left.