How to Find Fractions Equivalent to 21/20
1. Choose a multiplier
Use the same non-zero number for both terms; start with 2.
2. Multiply both terms
21 × 2 = 42 and 20 × 2 = 40.
3. Verify the ratio
21 × 40 and 20 × 42 both equal 840.
What Is Equivalent to 21/20?
Direct answer
42/40, 63/60, and 84/80 are equivalent to 21/20.
Fraction Converter
Enter whole-number numerator and denominator values. Results update instantly.
Simplified
21/20
Decimal
1.05
Percent
105%
Equivalent fractions
42/40 · 63/60 · 84/80
Equivalent Fraction Table for 21/20
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 | (21 × 2) / (20 × 2) | 42/40 | 21 × 40 = 20 × 42 |
| × 3 | (21 × 3) / (20 × 3) | 63/60 | 21 × 60 = 20 × 63 |
| × 4 | (21 × 4) / (20 × 4) | 84/80 | 21 × 80 = 20 × 84 |
| × 5 | (21 × 5) / (20 × 5) | 105/100 | 21 × 100 = 20 × 105 |
| × 6 | (21 × 6) / (20 × 6) | 126/120 | 21 × 120 = 20 × 126 |
| × 7 | (21 × 7) / (20 × 7) | 147/140 | 21 × 140 = 20 × 147 |
Where 21/20 Appears
This value is greater than one whole, so it is useful for rates, recipe scaling, and measurements that exceed one unit.
Learning tip: Convert an improper fraction to a mixed number when a real-world measurement is easier to read that way.
Compare Every Form
- Fraction21/20
- Simplified fraction21/20
- Decimal1.05
- Percent105%
Frequently Asked Questions
What fraction is equivalent to 21/20?
42/40 is one equivalent fraction because both terms were multiplied by 2.
Is 21/20 already simplified?
Yes. 21/20 is in lowest terms because its terms share no factor greater than 1.
How can I check an equivalent fraction for 21/20?
Cross-multiply. If the two cross-products are equal, the fractions represent the same value.
What are the decimal and percent forms of 21/20?
21/20 equals 1.05 as a decimal and 105% as a percentage.