Subtract 20/16 from 81/2
1st number: 40 1/2, 2nd number: 1 4/16
81/2 - 20/16 is 157/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 16 is 16
Next, find the equivalent fraction of both fractional numbers with denominator 16 - For the 1st fraction, since 2 × 8 = 16,
81/2 = 81 × 8/2 × 8 = 648/16 - Likewise, for the 2nd fraction, since 16 × 1 = 16,
20/16 = 20 × 1/16 × 1 = 20/16 - Subtract the two like fractions:
648/16 - 20/16 = 648 - 20/16 = 628/16 - After reducing the fraction, the answer is 157/4
- In mixed form: 391/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/2-40/16 81/4-20/16 81/2-20/32 81/2-60/16 81/6-20/16 81/2-20/48 81/10-20/16 81/2-20/80 81/14-20/16