Subtract 7/10 from 30/42
30/42 - 7/10 is 1/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
30/42 = 30 × 5/42 × 5 = 150/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
7/10 = 7 × 21/10 × 21 = 147/210 - Subtract the two like fractions:
150/210 - 147/210 = 150 - 147/210 = 3/210 - After reducing the fraction, the answer is 1/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42-7/10 30/42-14/10 30/84-7/10 30/42-7/20 90/42-7/10 30/42-21/10 30/42-7/30 30/42-35/10 30/42-7/50 30/42-49/10 30/42-7/70