Subtract 7/40 from 10/84
10/84 - 7/40 is -47/840.
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,
10/84 = 10 × 10/84 × 10 = 100/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
7/40 = 7 × 21/40 × 21 = 147/840 - Subtract the two like fractions:
100/840 - 147/840 = 100 - 147/840 = -47/840
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/84-7/40 10/84-14/40 10/84-7/80 30/84-7/40 10/84-21/40 50/84-7/40 10/84-35/40 70/84-7/40 10/84-49/40