Subtract 70/7 from 63/42
1st number: 1 21/42, 2nd number: 10 0/7
63/42 - 70/7 is -17/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 7 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
63/42 = 63 × 1/42 × 1 = 63/42 - Likewise, for the 2nd fraction, since 7 × 6 = 42,
70/7 = 70 × 6/7 × 6 = 420/42 - Subtract the two like fractions:
63/42 - 420/42 = 63 - 420/42 = -357/42 - After reducing the fraction, the answer is -17/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/84-70/7 63/42-70/14 63/42-70/21 63/42-70/35 63/42-70/49