Subtract 45/70 from 40/49
40/49 - 45/70 is 17/98.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 70 is 490
Next, find the equivalent fraction of both fractional numbers with denominator 490 - For the 1st fraction, since 49 × 10 = 490,
40/49 = 40 × 10/49 × 10 = 400/490 - Likewise, for the 2nd fraction, since 70 × 7 = 490,
45/70 = 45 × 7/70 × 7 = 315/490 - Subtract the two like fractions:
400/490 - 315/490 = 400 - 315/490 = 85/490 - After reducing the fraction, the answer is 17/98
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/49-45/70 40/49-90/70 40/98-45/70