Subtract 54/8 from 84/42
1st number: 2 0/42, 2nd number: 6 6/8
84/42 - 54/8 is -19/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
84/42 = 84 × 4/42 × 4 = 336/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
54/8 = 54 × 21/8 × 21 = 1134/168 - Subtract the two like fractions:
336/168 - 1134/168 = 336 - 1134/168 = -798/168 - After reducing the fraction, the answer is -19/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/42-54/16 84/42-54/24 84/42-54/40 84/42-54/56