Subtract 70/21 from 12/8
1st number: 1 4/8, 2nd number: 3 7/21
12/8 - 70/21 is -11/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
12/8 = 12 × 21/8 × 21 = 252/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
70/21 = 70 × 8/21 × 8 = 560/168 - Subtract the two like fractions:
252/168 - 560/168 = 252 - 560/168 = -308/168 - After reducing the fraction, the answer is -11/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/8-70/21 12/16-70/21 12/8-70/42 36/8-70/21 12/24-70/21 12/8-70/63 60/8-70/21 12/40-70/21 84/8-70/21 12/56-70/21