Subtract 56/40 from 21/18
1st number: 1 3/18, 2nd number: 1 16/40
21/18 - 56/40 is -7/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 18 × 20 = 360,
21/18 = 21 × 20/18 × 20 = 420/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
56/40 = 56 × 9/40 × 9 = 504/360 - Subtract the two like fractions:
420/360 - 504/360 = 420 - 504/360 = -84/360 - After reducing the fraction, the answer is -7/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-56/40 21/36-56/40 21/18-56/80 63/18-56/40 21/54-56/40 21/90-56/40