Subtract 42/24 from 75/21
1st number: 3 12/21, 2nd number: 1 18/24
75/21 - 42/24 is 51/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 24 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
75/21 = 75 × 8/21 × 8 = 600/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
42/24 = 42 × 7/24 × 7 = 294/168 - Subtract the two like fractions:
600/168 - 294/168 = 600 - 294/168 = 306/168 - After reducing the fraction, the answer is 51/28
- In mixed form: 123/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/21-84/24 75/42-42/24 75/21-42/48 75/63-42/24 75/21-42/72