Subtract 7/10 from 42/21
1st number: 2 0/21, 2nd number: 7/10
42/21 - 7/10 is 13/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
42/21 = 42 × 10/21 × 10 = 420/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
7/10 = 7 × 21/10 × 21 = 147/210 - Subtract the two like fractions:
420/210 - 147/210 = 420 - 147/210 = 273/210 - After reducing the fraction, the answer is 13/10
- In mixed form: 13/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-7/10 42/21-14/10 42/21-7/20 42/21-21/10 42/63-7/10 42/21-7/30 42/21-35/10 42/21-7/50 42/21-49/10 42/21-7/70