Subtract 1/84 from 28/40
28/40 - 1/84 is 289/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 84 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
28/40 = 28 × 21/40 × 21 = 588/840 - Likewise, for the 2nd fraction, since 84 × 10 = 840,
1/84 = 1 × 10/84 × 10 = 10/840 - Subtract the two like fractions:
588/840 - 10/840 = 588 - 10/840 = 578/840 - After reducing the fraction, the answer is 289/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40-1/84 28/40-2/84 28/80-1/84 84/40-1/84 28/40-3/84 28/40-5/84 28/40-7/84