Subtract 70/12 from 42/84
1st number: 42/84, 2nd number: 5 10/12
42/84 - 70/12 is -16/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
42/84 = 42 × 1/84 × 1 = 42/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
70/12 = 70 × 7/12 × 7 = 490/84 - Subtract the two like fractions:
42/84 - 490/84 = 42 - 490/84 = -448/84 - After reducing the fraction, the answer is -16/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84-70/24 42/84-70/36 42/84-70/60 42/84-70/84