Subtract 7/40 from 15/84
15/84 - 7/40 is 1/280.
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,
15/84 = 15 × 10/84 × 10 = 150/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
7/40 = 7 × 21/40 × 21 = 147/840 - Subtract the two like fractions:
150/840 - 147/840 = 150 - 147/840 = 3/840 - After reducing the fraction, the answer is 1/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/84-7/40 15/84-14/40 15/84-7/80 45/84-7/40 15/84-21/40 75/84-7/40 15/84-35/40 15/84-49/40