| A | B |
|---|
| 50% of a number | 50% = 1/2. Divide by 2 |
| 25% of a number | 25% = 1/4. Divide by 4 |
| 10% of a number | 10% = 1/10. Divide by 10. Move decimal one place to left <-- |
| 33 1/3% of a number | 33 1/3% = 1/3. Divide by 3 |
| 1% of a number | 1% = 1/100. Divide by 100. Move decimal two places to left <-- |
| 5% of a number | 5% = 1/2 of 10%. Divide by 10 then divide by 2 |
| 15% of a number | 15% = 10% + 5% |
| 75% of a number | 75% = 3/4. Divide by 4 then multiply by 3 |
| 66 2/3% of a number | 66 2/3% = 2/3. Divide by 3 then multiply by 2 |
| 30% of a number | 30% = 3 times 10% |
| 20% of a number | 20% = 2 times 10% |
| 40% of a number | 40% = 50% - 10% OR 4 times 10% |
| 90% of a number | 90% = 100% - 10% OR 9 times 10% |
| 60% of a number | 60% = 50% + 10% OR 6 times 10% |
| 70% of a number | 70% = 7 times 10% |
| 80% of a number | 80% = 8 times 10% |
