Subtract 18/21 from 16/35
16/35 - 18/21 is -2/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 35 × 3 = 105,
16/35 = 16 × 3/35 × 3 = 48/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
18/21 = 18 × 5/21 × 5 = 90/105 - Subtract the two like fractions:
48/105 - 90/105 = 48 - 90/105 = -42/105 - After reducing the fraction, the answer is -2/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/35-18/21 16/35-36/21 16/70-18/21 16/35-18/42 48/35-18/21 16/35-54/21 16/35-18/63 80/35-18/21 16/35-90/21