Answers

Subtract 84/48 from 21/90

1^st number: 21/90, 2^nd number: 1 36/48

21/90 - 84/48 is -91/60.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 48 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 90 × 8 = 720,
   21/90 = 21 × 8/90 × 8 = 168/720
3. Likewise, for the 2nd fraction, since 48 × 15 = 720,
   84/48 = 84 × 15/48 × 15 = 1260/720
4. Subtract the two like fractions:
   168/720 - 1260/720 = 168 - 1260/720 = -1092/720
5. After reducing the fraction, the answer is -91/60

MathStep (Works offline)

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

Related: ⁴²/₉₀-⁸⁴/₄₈ ²¹/₉₀-⁸⁴/₉₆ ⁶³/₉₀-⁸⁴/₄₈

Subtract Fractions Calculator