Subtract 21/30 from 70/42
1st number: 1 28/42, 2nd number: 21/30
70/42 - 21/30 is 29/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
70/42 = 70 × 5/42 × 5 = 350/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Subtract the two like fractions:
350/210 - 147/210 = 350 - 147/210 = 203/210 - After reducing the fraction, the answer is 29/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42-42/30 70/84-21/30 70/42-21/60 70/42-63/30 70/42-21/90