Add 90/20 and 15/72
1st number: 4 10/20, 2nd number: 15/72
90/20 + 15/72 is 113/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 20 × 18 = 360,
90/20 = 90 × 18/20 × 18 = 1620/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
15/72 = 15 × 5/72 × 5 = 75/360 - Add the two like fractions:
1620/360 + 75/360 = 1620 + 75/360 = 1695/360 - 1695/360 simplified gives 113/24
- So, 90/20 + 15/72 = 113/24
In mixed form: 417/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+30/72 90/40+15/72 90/20+45/72 90/60+15/72 90/20+75/72