Answers

Subtract 40/49 from 21/8

1^st number: 2 5/8, 2^nd number: 40/49

21/8 - 40/49 is 709/392.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 8 and 49 is 392
   
   Next, find the equivalent fraction of both fractional numbers with denominator 392
2. For the 1st fraction, since 8 × 49 = 392,
   21/8 = 21 × 49/8 × 49 = 1029/392
3. Likewise, for the 2nd fraction, since 49 × 8 = 392,
   40/49 = 40 × 8/49 × 8 = 320/392
4. Subtract the two like fractions:
   1029/392 - 320/392 = 1029 - 320/392 = 709/392
5. In mixed form: 1317/392

MathStep (Works offline)

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

Related: ⁴²/₈-⁴⁰/₄₉ ²¹/₈-⁸⁰/₄₉ ²¹/₁₆-⁴⁰/₄₉ ²¹/₈-⁴⁰/₉₈ ⁶³/₈-⁴⁰/₄₉ ²¹/₂₄-⁴⁰/₄₉ ²¹/₄₀-⁴⁰/₄₉ ²¹/₅₆-⁴⁰/₄₉

Subtract Fractions Calculator