Add 7/56 and 81/90
7/56 + 81/90 is 41/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 90 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 56 × 45 = 2520,
7/56 = 7 × 45/56 × 45 = 315/2520 - Likewise, for the 2nd fraction, since 90 × 28 = 2520,
81/90 = 81 × 28/90 × 28 = 2268/2520 - Add the two like fractions:
315/2520 + 2268/2520 = 315 + 2268/2520 = 2583/2520 - 2583/2520 simplified gives 41/40
- So, 7/56 + 81/90 = 41/40
In mixed form: 11/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/56+81/90 21/56+81/90 35/56+81/90 49/56+81/90