Subtract 21/90 from 16/35
16/35 - 21/90 is 47/210.
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,
16/35 = 16 × 18/35 × 18 = 288/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630 - Subtract the two like fractions:
288/630 - 147/630 = 288 - 147/630 = 141/630 - After reducing the fraction, the answer is 47/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/35-21/90 16/35-42/90 16/70-21/90 48/35-21/90 16/35-63/90 80/35-21/90