Subtract 42/70 from 7/16
7/16 - 42/70 is -13/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 70 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 16 × 35 = 560,
7/16 = 7 × 35/16 × 35 = 245/560 - Likewise, for the 2nd fraction, since 70 × 8 = 560,
42/70 = 42 × 8/70 × 8 = 336/560 - Subtract the two like fractions:
245/560 - 336/560 = 245 - 336/560 = -91/560 - After reducing the fraction, the answer is -13/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/16-42/70 7/16-84/70 7/32-42/70 21/16-42/70 7/48-42/70 35/16-42/70 7/80-42/70 49/16-42/70