Add 45/21 and 81/8
1st number: 2 3/21, 2nd number: 10 1/8
45/21 + 81/8 is 687/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
45/21 = 45 × 8/21 × 8 = 360/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
81/8 = 81 × 21/8 × 21 = 1701/168 - Add the two like fractions:
360/168 + 1701/168 = 360 + 1701/168 = 2061/168 - 2061/168 simplified gives 687/56
- So, 45/21 + 81/8 = 687/56
In mixed form: 1215/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+81/8 45/42+81/8 45/21+81/16 45/63+81/8 45/21+81/24 45/21+81/40 45/21+81/56