Answers

Subtract 2/30 from 42/21

1^st number: 2 0/21, 2^nd number: 2/30

42/21 - 2/30 is 29/15.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 30 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 21 × 10 = 210,
   42/21 = 42 × 10/21 × 10 = 420/210
3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
   2/30 = 2 × 7/30 × 7 = 14/210
4. Subtract the two like fractions:
   420/210 - 14/210 = 420 - 14/210 = 406/210
5. After reducing the fraction, the answer is 29/15
6. In mixed form: 114/15

MathStep (Works offline)

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

Related: ⁸⁴/₂₁-²/₃₀ ⁴²/₂₁-⁴/₃₀ ⁴²/₂₁-²/₆₀ ⁴²/₂₁-⁶/₃₀ ⁴²/₆₃-²/₃₀ ⁴²/₂₁-²/₉₀ ⁴²/₂₁-¹⁰/₃₀ ⁴²/₂₁-¹⁴/₃₀

Subtract Fractions Calculator