Add 81/56 and 3/90
1st number: 1 25/56, 2nd number: 3/90
81/56 + 3/90 is 1243/840.
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,
81/56 = 81 × 45/56 × 45 = 3645/2520 - Likewise, for the 2nd fraction, since 90 × 28 = 2520,
3/90 = 3 × 28/90 × 28 = 84/2520 - Add the two like fractions:
3645/2520 + 84/2520 = 3645 + 84/2520 = 3729/2520 - 3729/2520 simplified gives 1243/840
- So, 81/56 + 3/90 = 1243/840
In mixed form: 1403/840
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/56+6/90 81/56+9/90 81/56+15/90 81/56+21/90