Add 90/20 and 80/72
1st number: 4 10/20, 2nd number: 1 8/72
90/20 + 80/72 is 101/18.
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,
80/72 = 80 × 5/72 × 5 = 400/360 - Add the two like fractions:
1620/360 + 400/360 = 1620 + 400/360 = 2020/360 - 2020/360 simplified gives 101/18
- So, 90/20 + 80/72 = 101/18
In mixed form: 511/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/40+80/72 90/60+80/72