Add 90/72 and 70/15
1st number: 1 18/72, 2nd number: 4 10/15
90/72 + 70/15 is 71/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 15 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
90/72 = 90 × 5/72 × 5 = 450/360 - Likewise, for the 2nd fraction, since 15 × 24 = 360,
70/15 = 70 × 24/15 × 24 = 1680/360 - Add the two like fractions:
450/360 + 1680/360 = 450 + 1680/360 = 2130/360 - 2130/360 simplified gives 71/12
- So, 90/72 + 70/15 = 71/12
In mixed form: 511/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/72+70/30 90/72+70/45 90/72+70/75