Subtract 45/30 from 90/84
1st number: 1 6/84, 2nd number: 1 15/30
90/84 - 45/30 is -3/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
90/84 = 90 × 5/84 × 5 = 450/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
45/30 = 45 × 14/30 × 14 = 630/420 - Subtract the two like fractions:
450/420 - 630/420 = 450 - 630/420 = -180/420 - After reducing the fraction, the answer is -3/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84-90/30 90/84-45/60 90/84-45/90