Subtract 21/27 from 70/42
1st number: 1 28/42, 2nd number: 21/27
70/42 - 21/27 is 8/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 27 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 42 × 9 = 378,
70/42 = 70 × 9/42 × 9 = 630/378 - Likewise, for the 2nd fraction, since 27 × 14 = 378,
21/27 = 21 × 14/27 × 14 = 294/378 - Subtract the two like fractions:
630/378 - 294/378 = 630 - 294/378 = 336/378 - After reducing the fraction, the answer is 8/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42-42/27 70/84-21/27 70/42-21/54 70/42-63/27 70/42-21/81