Subtract 70/8 from 42/18
1st number: 2 6/18, 2nd number: 8 6/8
42/18 - 70/8 is -77/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 18 × 4 = 72,
42/18 = 42 × 4/18 × 4 = 168/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
70/8 = 70 × 9/8 × 9 = 630/72 - Subtract the two like fractions:
168/72 - 630/72 = 168 - 630/72 = -462/72 - After reducing the fraction, the answer is -77/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/18-70/8 42/36-70/8 42/18-70/16 42/54-70/8 42/18-70/24 42/90-70/8 42/18-70/40 42/18-70/56