Percent means part of 100. Percent (%) is a ratio (fraction) where the bottom number is 100.
eg. Mary got 80% on her test. She got 80 out of 100 answers right.
80% is 80/100.

Percentages include:

• simple interest
• mark-ups
• mark-downs

The easiest way to handle simple percentages is to use two fractions and 'cross-multiply' them.
eg. To find 12% of 50,
- we know that 12% is 12/100 of 50
- can also be written as 12/100 = ?/50.
- Then to find ?, we cross multiply: (12 × 50) = (? × 100),
- which can also be written ? = (12 × 50) ÷ 100
- which equals 600 ÷ 100 or 6.
so 12% of 50 is 6.

See our Teaching Resources for Math for percentage worksheets, lesson plans, etc.

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