Recall that 1% means 1 for each 100, 1 out of 100, or one one-hundredth.

We can divide 1 by 100 to convert 1% to a decimal. 1% is equal to 0.01. Notice that dividing by one hundred moves the decimal point two places to the left.

Recall that 10% means 10 for each 100, 10 out of 100, or ten one-hundredths.

We can divide 1 by 10 to convert 10% to a decimal. 10% is equal to 0.1. Notice that dividing by ten moves the decimal point one place to the left.

“Special percents” are easy to compute because they represent easy-to-calculate amounts.

0% means “none of it”

25% means “a quarter of it”

50% means “half of it”

100% means “all of it”

200% means “all of it, twice”

To find 100% of 30 we take “all of it”.