Subtract 84/4 from 20/70
1st number: 20/70, 2nd number: 21 0/4
20/70 - 84/4 is -145/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 4 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
20/70 = 20 × 2/70 × 2 = 40/140 - Likewise, for the 2nd fraction, since 4 × 35 = 140,
84/4 = 84 × 35/4 × 35 = 2940/140 - Subtract the two like fractions:
40/140 - 2940/140 = 40 - 2940/140 = -2900/140 - After reducing the fraction, the answer is -145/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/70-84/4 20/70-84/8 60/70-84/4 20/70-84/12 20/70-84/20 20/70-84/28