Add 21/8 and 80/90
1st number: 2 5/8, 2nd number: 80/90
21/8 + 80/90 is 253/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 8 × 45 = 360,
21/8 = 21 × 45/8 × 45 = 945/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
80/90 = 80 × 4/90 × 4 = 320/360 - Add the two like fractions:
945/360 + 320/360 = 945 + 320/360 = 1265/360 - 1265/360 simplified gives 253/72
- So, 21/8 + 80/90 = 253/72
In mixed form: 337/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8+80/90 21/16+80/90 63/8+80/90 21/24+80/90 21/40+80/90 21/56+80/90