Subtract 7/20 from 42/70
42/70 - 7/20 is 1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
42/70 = 42 × 2/70 × 2 = 84/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
7/20 = 7 × 7/20 × 7 = 49/140 - Subtract the two like fractions:
84/140 - 49/140 = 84 - 49/140 = 35/140 - After reducing the fraction, the answer is 1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70-7/20 42/70-14/20 42/70-7/40 42/70-21/20 42/70-7/60 42/70-35/20 42/70-49/20