Subtract 1/35 from 21/90
21/90 - 1/35 is 43/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 35 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630 - Likewise, for the 2nd fraction, since 35 × 18 = 630,
1/35 = 1 × 18/35 × 18 = 18/630 - Subtract the two like fractions:
147/630 - 18/630 = 147 - 18/630 = 129/630 - After reducing the fraction, the answer is 43/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90-1/35 21/90-2/35 21/90-1/70 63/90-1/35 21/90-3/35 21/90-5/35 21/90-7/35