Subtract 1/15 from 16/21
16/21 - 1/15 is 73/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
16/21 = 16 × 5/21 × 5 = 80/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
1/15 = 1 × 7/15 × 7 = 7/105 - Subtract the two like fractions:
80/105 - 7/105 = 80 - 7/105 = 73/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/21-1/15 16/21-2/15 16/42-1/15 16/21-1/30 48/21-1/15 16/21-3/15 16/63-1/15 16/21-1/45 80/21-1/15 16/21-5/15 16/21-1/75 16/21-7/15