Answers

Subtract 21/40 from 84/15

1^st number: 5 9/15, 2^nd number: 21/40

84/15 - 21/40 is 203/40.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 40 is 120
   
   Next, find the equivalent fraction of both fractional numbers with denominator 120
2. For the 1st fraction, since 15 × 8 = 120,
   84/15 = 84 × 8/15 × 8 = 672/120
3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
   21/40 = 21 × 3/40 × 3 = 63/120
4. Subtract the two like fractions:
   672/120 - 63/120 = 672 - 63/120 = 609/120
5. After reducing the fraction, the answer is 203/40
6. In mixed form: 53/40

MathStep (Works offline)

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

Related: ⁸⁴/₁₅-⁴²/₄₀ ⁸⁴/₃₀-²¹/₄₀ ⁸⁴/₁₅-²¹/₈₀ ⁸⁴/₁₅-⁶³/₄₀ ⁸⁴/₄₅-²¹/₄₀ ⁸⁴/₇₅-²¹/₄₀

Subtract Fractions Calculator