Subtract 10/20 from 4/84
4/84 - 10/20 is -19/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
4/84 = 4 × 5/84 × 5 = 20/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
10/20 = 10 × 21/20 × 21 = 210/420 - Subtract the two like fractions:
20/420 - 210/420 = 20 - 210/420 = -190/420 - After reducing the fraction, the answer is -19/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/84-10/20 4/84-10/40 12/84-10/20 4/84-30/20 4/84-10/60 20/84-10/20 4/84-50/20 28/84-10/20 4/84-70/20