Subtract 63/42 from 25/40
1st number: 25/40, 2nd number: 1 21/42
25/40 - 63/42 is -7/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
25/40 = 25 × 21/40 × 21 = 525/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
63/42 = 63 × 20/42 × 20 = 1260/840 - Subtract the two like fractions:
525/840 - 1260/840 = 525 - 1260/840 = -735/840 - After reducing the fraction, the answer is -7/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/40-63/42 25/80-63/42 25/40-63/84 75/40-63/42