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QR questions frequently involve decimals (prices like £4.75, measurements like 2.5 kg) and fractions (1/4 of a total, 2/3 of a distance). Being able to convert fluently between decimals, fractions, and percentages — and to calculate with all three forms — eliminates hesitation and saves valuable seconds.
Every rational number can be expressed as a fraction, a decimal, or a percentage. Fluent conversion between these three forms is essential.
| Fraction | Division | Decimal |
|---|---|---|
| 1/2 | 1 ÷ 2 | 0.5 |
| 1/4 | 1 ÷ 4 | 0.25 |
| 3/4 | 3 ÷ 4 | 0.75 |
| 1/5 | 1 ÷ 5 | 0.2 |
| 1/8 | 1 ÷ 8 | 0.125 |
| 1/3 | 1 ÷ 3 | 0.333... |
| 2/3 | 2 ÷ 3 | 0.667... |
| Decimal | ×100 | Percentage |
|---|---|---|
| 0.35 | 35 | 35% |
| 0.08 | 8 | 8% |
| 1.25 | 125 | 125% |
| 0.667 | 66.7 | 66.7% |
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