Answers

Subtract 28/5 from 42/84

1^st number: 42/84, 2^nd number: 5 3/5

42/84 - 28/5 is -51/10.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 5 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   42/84 = 42 × 5/84 × 5 = 210/420
3. Likewise, for the 2nd fraction, since 5 × 84 = 420,
   28/5 = 28 × 84/5 × 84 = 2352/420
4. Subtract the two like fractions:
   210/420 - 2352/420 = 210 - 2352/420 = -2142/420
5. After reducing the fraction, the answer is -51/10

MathStep (Works offline)

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

Related: ⁴²/₈₄-⁵⁶/₅ ⁴²/₈₄-²⁸/₁₀ ⁴²/₈₄-⁸⁴/₅ ⁴²/₈₄-²⁸/₁₅ ⁴²/₈₄-²⁸/₂₅ ⁴²/₈₄-²⁸/₃₅

Subtract Fractions Calculator