Subtract 16/10 from 21/42
1st number: 21/42, 2nd number: 1 6/10
21/42 - 16/10 is -11/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
16/10 = 16 × 21/10 × 21 = 336/210 - Subtract the two like fractions:
105/210 - 336/210 = 105 - 336/210 = -231/210 - After reducing the fraction, the answer is -11/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42-32/10 21/84-16/10 21/42-16/20 63/42-16/10 21/42-48/10 21/42-16/30 21/42-80/10 21/42-16/50 21/42-16/70