Subtract 15/42 from 90/8
1st number: 11 2/8, 2nd number: 15/42
90/8 - 15/42 is 305/28.
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,
15/42 = 15 × 4/42 × 4 = 60/168 - Subtract the two like fractions:
1890/168 - 60/168 = 1890 - 60/168 = 1830/168 - After reducing the fraction, the answer is 305/28
- In mixed form: 1025/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/8-30/42 90/16-15/42 90/8-15/84 90/8-45/42 90/24-15/42 90/8-75/42 90/40-15/42 90/56-15/42