Subtract 7/42 from 21/63
21/63 - 7/42 is 1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 42 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 63 × 2 = 126,
21/63 = 21 × 2/63 × 2 = 42/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
7/42 = 7 × 3/42 × 3 = 21/126 - Subtract the two like fractions:
42/126 - 21/126 = 42 - 21/126 = 21/126 - After reducing the fraction, the answer is 1/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63-7/42 21/63-14/42 21/63-7/84 21/63-21/42 21/63-35/42 21/63-49/42