Subtract 56/40 from 84/64
1st number: 1 20/64, 2nd number: 1 16/40
84/64 - 56/40 is -7/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 64 and 40 is 320
Next, find the equivalent fraction of both fractional numbers with denominator 320 - For the 1st fraction, since 64 × 5 = 320,
84/64 = 84 × 5/64 × 5 = 420/320 - Likewise, for the 2nd fraction, since 40 × 8 = 320,
56/40 = 56 × 8/40 × 8 = 448/320 - Subtract the two like fractions:
420/320 - 448/320 = 420 - 448/320 = -28/320 - After reducing the fraction, the answer is -7/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/64-56/80