Subtract 30/63 from 28/42
28/42 - 30/63 is 4/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 63 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
28/42 = 28 × 3/42 × 3 = 84/126 - Likewise, for the 2nd fraction, since 63 × 2 = 126,
30/63 = 30 × 2/63 × 2 = 60/126 - Subtract the two like fractions:
84/126 - 60/126 = 84 - 60/126 = 24/126 - After reducing the fraction, the answer is 4/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-30/63 28/42-60/63 28/84-30/63 84/42-30/63 28/42-90/63