How to Find Fractions Equivalent to 4/5
1. Choose a multiplier
Use the same non-zero number for both terms; start with 2.
2. Multiply both terms
4 × 2 = 8 and 5 × 2 = 10.
3. Verify the ratio
4 × 10 and 5 × 8 both equal 40.
Direct answer
8/10, 12/15, and 16/20 are equivalent to 4/5.
Enter whole-number numerator and denominator values. Results update instantly.
4/5
0.8
80%
8/10 · 12/15 · 16/20
Use the same non-zero number for both terms; start with 2.
4 × 2 = 8 and 5 × 2 = 10.
4 × 10 and 5 × 8 both equal 40.
Multiply the numerator and denominator by the same non-zero whole number. The written numbers change, but the ratio stays equal.
| Multiplier | Calculation | Equivalent fraction | Cross-product check |
|---|---|---|---|
| × 2 | (4 × 2) / (5 × 2) | 8/10 | 4 × 10 = 5 × 8 |
| × 3 | (4 × 3) / (5 × 3) | 12/15 | 4 × 15 = 5 × 12 |
| × 4 | (4 × 4) / (5 × 4) | 16/20 | 4 × 20 = 5 × 16 |
| × 5 | (4 × 5) / (5 × 5) | 20/25 | 4 × 25 = 5 × 20 |
| × 6 | (4 × 6) / (5 × 6) | 24/30 | 4 × 30 = 5 × 24 |
| × 7 | (4 × 7) / (5 × 7) | 28/35 | 4 × 35 = 5 × 28 |
This fraction converts to a familiar benchmark percentage, which helps with estimation, discounts, grades, and progress tracking.
Learning tip: Memorize common benchmark fractions so you can estimate an answer before calculating.
8/10 is one equivalent fraction because both terms were multiplied by 2.
Yes. 4/5 is in lowest terms because its terms share no factor greater than 1.
Cross-multiply. If the two cross-products are equal, the fractions represent the same value.
4/5 equals 0.8 as a decimal and 80% as a percentage.