Subtract 16/40 from 1/21
1/21 - 16/40 is -37/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
1/21 = 1 × 40/21 × 40 = 40/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
16/40 = 16 × 21/40 × 21 = 336/840 - Subtract the two like fractions:
40/840 - 336/840 = 40 - 336/840 = -296/840 - After reducing the fraction, the answer is -37/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-16/40 1/21-32/40 1/42-16/40 1/21-16/80 3/21-16/40 1/21-48/40 1/63-16/40 5/21-16/40 1/21-80/40 7/21-16/40