Answers

Subtract 21/84 from 49/20

1^st number: 2 9/20, 2^nd number: 21/84

49/20 - 21/84 is 11/5.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 84 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 20 × 21 = 420,
   49/20 = 49 × 21/20 × 21 = 1029/420
3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
   21/84 = 21 × 5/84 × 5 = 105/420
4. Subtract the two like fractions:
   1029/420 - 105/420 = 1029 - 105/420 = 924/420
5. After reducing the fraction, the answer is 11/5
6. In mixed form: 21/5

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁹⁸/₂₀-²¹/₈₄ ⁴⁹/₂₀-⁴²/₈₄ ⁴⁹/₄₀-²¹/₈₄ ⁴⁹/₂₀-⁶³/₈₄ ⁴⁹/₆₀-²¹/₈₄

Subtract Fractions Calculator