Answers

Subtract 42/84 from 84/40

1^st number: 2 4/40, 2^nd number: 42/84

84/40 - 42/84 is 8/5.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 84 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 40 × 21 = 840,
   84/40 = 84 × 21/40 × 21 = 1764/840
3. Likewise, for the 2nd fraction, since 84 × 10 = 840,
   42/84 = 42 × 10/84 × 10 = 420/840
4. Subtract the two like fractions:
   1764/840 - 420/840 = 1764 - 420/840 = 1344/840
5. After reducing the fraction, the answer is 8/5
6. In mixed form: 13/5

MathStep (Works offline)

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

Related: ⁸⁴/₈₀-⁴²/₈₄

Subtract Fractions Calculator