Subtract 1/20 from 45/84
45/84 - 1/20 is 17/35.
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,
45/84 = 45 × 5/84 × 5 = 225/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
1/20 = 1 × 21/20 × 21 = 21/420 - Subtract the two like fractions:
225/420 - 21/420 = 225 - 21/420 = 204/420 - After reducing the fraction, the answer is 17/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84-1/20 45/84-2/20 45/84-1/40 45/84-3/20 45/84-1/60 45/84-5/20 45/84-7/20