Subtract 42/16 from 21/70
1st number: 21/70, 2nd number: 2 10/16
21/70 - 42/16 is -93/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 16 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 70 × 8 = 560,
21/70 = 21 × 8/70 × 8 = 168/560 - Likewise, for the 2nd fraction, since 16 × 35 = 560,
42/16 = 42 × 35/16 × 35 = 1470/560 - Subtract the two like fractions:
168/560 - 1470/560 = 168 - 1470/560 = -1302/560 - After reducing the fraction, the answer is -93/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70-42/16 21/70-84/16 21/70-42/32 63/70-42/16 21/70-42/48 21/70-42/80