Subtract 70/42 from 90/8
1st number: 11 2/8, 2nd number: 1 28/42
90/8 - 70/42 is 115/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
90/8 = 90 × 21/8 × 21 = 1890/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
70/42 = 70 × 4/42 × 4 = 280/168 - Subtract the two like fractions:
1890/168 - 280/168 = 1890 - 280/168 = 1610/168 - After reducing the fraction, the answer is 115/12
- In mixed form: 97/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/16-70/42 90/8-70/84 90/24-70/42 90/40-70/42 90/56-70/42