Add 81/90 and 5/8
81/90 + 5/8 is 61/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 8 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
81/90 = 81 × 4/90 × 4 = 324/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
5/8 = 5 × 45/8 × 45 = 225/360 - Add the two like fractions:
324/360 + 225/360 = 324 + 225/360 = 549/360 - 549/360 simplified gives 61/40
- So, 81/90 + 5/8 = 61/40
In mixed form: 121/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/90+10/8 81/90+5/16 81/90+15/8 81/90+5/24 81/90+25/8 81/90+5/40 81/90+35/8 81/90+5/56