Answers

Subtract 30/4 from 21/30

1^st number: 21/30, 2^nd number: 7 2/4

21/30 - 30/4 is -34/5.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 30 and 4 is 60
   
   Next, find the equivalent fraction of both fractional numbers with denominator 60
2. For the 1st fraction, since 30 × 2 = 60,
   21/30 = 21 × 2/30 × 2 = 42/60
3. Likewise, for the 2nd fraction, since 4 × 15 = 60,
   30/4 = 30 × 15/4 × 15 = 450/60
4. Subtract the two like fractions:
   42/60 - 450/60 = 42 - 450/60 = -408/60
5. After reducing the fraction, the answer is -34/5

MathStep (Works offline)

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

Related: ⁴²/₃₀-³⁰/₄ ²¹/₃₀-⁶⁰/₄ ²¹/₆₀-³⁰/₄ ²¹/₃₀-³⁰/₈ ⁶³/₃₀-³⁰/₄ ²¹/₃₀-⁹⁰/₄ ²¹/₉₀-³⁰/₄ ²¹/₃₀-³⁰/₁₂ ²¹/₃₀-³⁰/₂₀ ²¹/₃₀-³⁰/₂₈

Subtract Fractions Calculator