Add 90/20 and 7/72
1st number: 4 10/20, 2nd number: 7/72
90/20 + 7/72 is 331/72.
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,
7/72 = 7 × 5/72 × 5 = 35/360 - Add the two like fractions:
1620/360 + 35/360 = 1620 + 35/360 = 1655/360 - 1655/360 simplified gives 331/72
- So, 90/20 + 7/72 = 331/72
In mixed form: 443/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+14/72 90/40+7/72 90/20+21/72 90/60+7/72 90/20+35/72 90/20+49/72