Subtract 3/40 from 21/14
1st number: 1 7/14, 2nd number: 3/40
21/14 - 3/40 is 57/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 14 × 20 = 280,
21/14 = 21 × 20/14 × 20 = 420/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
3/40 = 3 × 7/40 × 7 = 21/280 - Subtract the two like fractions:
420/280 - 21/280 = 420 - 21/280 = 399/280 - After reducing the fraction, the answer is 57/40
- In mixed form: 117/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/14-3/40 21/14-6/40 21/28-3/40 21/14-3/80 63/14-3/40 21/14-9/40 21/42-3/40 21/14-15/40 21/70-3/40 21/14-21/40 21/98-3/40