Subtract 20/70 from 15/64
15/64 - 20/70 is -23/448.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 64 and 70 is 2240
Next, find the equivalent fraction of both fractional numbers with denominator 2240 - For the 1st fraction, since 64 × 35 = 2240,
15/64 = 15 × 35/64 × 35 = 525/2240 - Likewise, for the 2nd fraction, since 70 × 32 = 2240,
20/70 = 20 × 32/70 × 32 = 640/2240 - Subtract the two like fractions:
525/2240 - 640/2240 = 525 - 640/2240 = -115/2240 - After reducing the fraction, the answer is -23/448
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/64-20/70 15/64-40/70 45/64-20/70 15/64-60/70 75/64-20/70