Subtract 12/21 from 81/8
1st number: 10 1/8, 2nd number: 12/21
81/8 - 12/21 is 535/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
81/8 = 81 × 21/8 × 21 = 1701/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
12/21 = 12 × 8/21 × 8 = 96/168 - Subtract the two like fractions:
1701/168 - 96/168 = 1701 - 96/168 = 1605/168 - After reducing the fraction, the answer is 535/56
- In mixed form: 931/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/8-24/21 81/16-12/21 81/8-12/42 81/8-36/21 81/24-12/21 81/8-12/63 81/8-60/21 81/40-12/21 81/8-84/21 81/56-12/21