Add 72/90 and 30/8
1st number: 72/90, 2nd number: 3 6/8
72/90 + 30/8 is 91/20.
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,
72/90 = 72 × 4/90 × 4 = 288/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
30/8 = 30 × 45/8 × 45 = 1350/360 - Add the two like fractions:
288/360 + 1350/360 = 288 + 1350/360 = 1638/360 - 1638/360 simplified gives 91/20
- So, 72/90 + 30/8 = 91/20
In mixed form: 411/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/90+60/8 72/90+30/16 72/90+90/8 72/90+30/24 72/90+30/40 72/90+30/56