Subtract 63/40 from 25/42
1st number: 25/42, 2nd number: 1 23/40
25/42 - 63/40 is -823/840.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
25/42 = 25 × 20/42 × 20 = 500/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
63/40 = 63 × 21/40 × 21 = 1323/840 - Subtract the two like fractions:
500/840 - 1323/840 = 500 - 1323/840 = -823/840
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/42-63/40 25/84-63/40 25/42-63/80 75/42-63/40