Subtract 4/42 from 20/63
20/63 - 4/42 is 2/9.
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,
20/63 = 20 × 2/63 × 2 = 40/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
4/42 = 4 × 3/42 × 3 = 12/126 - Subtract the two like fractions:
40/126 - 12/126 = 40 - 12/126 = 28/126 - After reducing the fraction, the answer is 2/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/63-4/42 20/63-8/42 20/63-4/84 60/63-4/42 20/63-12/42 20/63-20/42 20/63-28/42