Subtract 25/40 from 40/84
40/84 - 25/40 is -25/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 84 × 10 = 840,
40/84 = 40 × 10/84 × 10 = 400/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
25/40 = 25 × 21/40 × 21 = 525/840 - Subtract the two like fractions:
400/840 - 525/840 = 400 - 525/840 = -125/840 - After reducing the fraction, the answer is -25/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84-25/40 40/84-50/40 40/84-25/80 40/84-75/40