Subtract 3/80 from 90/84
1st number: 1 6/84, 2nd number: 3/80
90/84 - 3/80 is 579/560.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 84 × 20 = 1680,
90/84 = 90 × 20/84 × 20 = 1800/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
3/80 = 3 × 21/80 × 21 = 63/1680 - Subtract the two like fractions:
1800/1680 - 63/1680 = 1800 - 63/1680 = 1737/1680 - After reducing the fraction, the answer is 579/560
- In mixed form: 119/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84-6/80 90/84-9/80 90/84-15/80 90/84-21/80