Subtract 21/90 from 24/35
24/35 - 21/90 is 19/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 35 × 18 = 630,
24/35 = 24 × 18/35 × 18 = 432/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630 - Subtract the two like fractions:
432/630 - 147/630 = 432 - 147/630 = 285/630 - After reducing the fraction, the answer is 19/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/35-21/90 24/35-42/90 24/70-21/90 72/35-21/90 24/35-63/90