Subtract 30/8 from 40/84
1st number: 40/84, 2nd number: 3 6/8
40/84 - 30/8 is -275/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
40/84 = 40 × 2/84 × 2 = 80/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
30/8 = 30 × 21/8 × 21 = 630/168 - Subtract the two like fractions:
80/168 - 630/168 = 80 - 630/168 = -550/168 - After reducing the fraction, the answer is -275/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84-30/8 40/84-60/8 40/84-30/16 40/84-90/8 40/84-30/24 40/84-30/40 40/84-30/56