Subtract 54/84 from 9/40
9/40 - 54/84 is -117/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 84 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
9/40 = 9 × 21/40 × 21 = 189/840 - Likewise, for the 2nd fraction, since 84 × 10 = 840,
54/84 = 54 × 10/84 × 10 = 540/840 - Subtract the two like fractions:
189/840 - 540/840 = 189 - 540/840 = -351/840 - After reducing the fraction, the answer is -117/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/40-54/84 9/80-54/84 27/40-54/84 45/40-54/84 63/40-54/84