Subtract 70/32 from 21/90
1st number: 21/90, 2nd number: 2 6/32
21/90 - 70/32 is -469/240.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 32 is 1440
Next, find the equivalent fraction of both fractional numbers with denominator 1440 - For the 1st fraction, since 90 × 16 = 1440,
21/90 = 21 × 16/90 × 16 = 336/1440 - Likewise, for the 2nd fraction, since 32 × 45 = 1440,
70/32 = 70 × 45/32 × 45 = 3150/1440 - Subtract the two like fractions:
336/1440 - 3150/1440 = 336 - 3150/1440 = -2814/1440 - After reducing the fraction, the answer is -469/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90-70/32 21/90-70/64 63/90-70/32 21/90-70/96