Subtract 5/40 from 9/84
9/84 - 5/40 is -1/56.
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,
9/84 = 9 × 10/84 × 10 = 90/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
5/40 = 5 × 21/40 × 21 = 105/840 - Subtract the two like fractions:
90/840 - 105/840 = 90 - 105/840 = -15/840 - After reducing the fraction, the answer is -1/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/84-5/40 9/84-10/40 9/84-5/80 27/84-5/40 9/84-15/40 45/84-5/40 9/84-25/40 63/84-5/40 9/84-35/40