Subtract 5/40 from 25/42
25/42 - 5/40 is 79/168.
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,
5/40 = 5 × 21/40 × 21 = 105/840 - Subtract the two like fractions:
500/840 - 105/840 = 500 - 105/840 = 395/840 - After reducing the fraction, the answer is 79/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/42-5/40 25/42-10/40 25/84-5/40 25/42-5/80 75/42-5/40 25/42-15/40 25/42-25/40 25/42-35/40