Common equivalents you should know by heart
These are the most common conversions. Knowing them by heart makes math faster — especially on tests, at the store, and in everyday calculations.
| Fraction | Decimal | Percent |
|---|---|---|
| 1/2 | 0.5 | 50% |
| 1/3 | 0.333… | 33.3% |
| 2/3 | 0.666… | 66.7% |
| 1/4 | 0.25 | 25% |
| 3/4 | 0.75 | 75% |
| 1/5 | 0.2 | 20% |
| 2/5 | 0.4 | 40% |
| 3/5 | 0.6 | 60% |
| 4/5 | 0.8 | 80% |
| 1/8 | 0.125 | 12.5% |
| 3/8 | 0.375 | 37.5% |
| 5/8 | 0.625 | 62.5% |
| 7/8 | 0.875 | 87.5% |
| 1/10 | 0.1 | 10% |
| 1/20 | 0.05 | 5% |
| 1/100 | 0.01 | 1% |
Each row shows the same value written three different ways. For example, 1/4, 0.25, and 25% are all the same amount — just expressed differently.
Start with the halves, quarters, and fifths — they come up most often in daily life. The eighths are useful for cooking and measurements. The thirds are essential for splitting things three ways.
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