Subtract 90/49 from 40/28
1st number: 1 12/28, 2nd number: 1 41/49
40/28 - 90/49 is -20/49.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 49 is 196
Next, find the equivalent fraction of both fractional numbers with denominator 196 - For the 1st fraction, since 28 × 7 = 196,
40/28 = 40 × 7/28 × 7 = 280/196 - Likewise, for the 2nd fraction, since 49 × 4 = 196,
90/49 = 90 × 4/49 × 4 = 360/196 - Subtract the two like fractions:
280/196 - 360/196 = 280 - 360/196 = -80/196 - After reducing the fraction, the answer is -20/49
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/28-90/49 40/56-90/49 40/28-90/98 40/84-90/49