Section 1: Start with the easy percentages
10% means divide by 10.
1% means divide by 100.
50% is half.
25% is a quarter.
Section 2: Build 20%, 30%, and 70%
To find 30% of a number, first find 10%, then multiply that answer by 3.
Example: 10% of 70 is 7, and 7 × 3 = 21, so 30% of 70 is 21.
Section 3: Including 75%
To find 75% of a number, first find 25%, then multiply that answer by 3.