Subtract 20/49 from 18/70
18/70 - 20/49 is -37/245.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 49 is 490
Next, find the equivalent fraction of both fractional numbers with denominator 490 - For the 1st fraction, since 70 × 7 = 490,
18/70 = 18 × 7/70 × 7 = 126/490 - Likewise, for the 2nd fraction, since 49 × 10 = 490,
20/49 = 20 × 10/49 × 10 = 200/490 - Subtract the two like fractions:
126/490 - 200/490 = 126 - 200/490 = -74/490 - After reducing the fraction, the answer is -37/245
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/70-20/49 18/70-40/49 18/70-20/98 54/70-20/49 18/70-60/49 90/70-20/49