Subtract 16/21 from 9/15
9/15 - 16/21 is -17/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
9/15 = 9 × 7/15 × 7 = 63/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
16/21 = 16 × 5/21 × 5 = 80/105 - Subtract the two like fractions:
63/105 - 80/105 = 63 - 80/105 = -17/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/15-16/21 9/15-32/21 9/30-16/21 9/15-16/42 27/15-16/21 9/15-48/21 9/45-16/21 9/15-16/63 45/15-16/21 9/15-80/21 9/75-16/21 63/15-16/21