Add 75/90 and 90/72
1st number: 75/90, 2nd number: 1 18/72
75/90 + 90/72 is 25/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
75/90 = 75 × 4/90 × 4 = 300/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
90/72 = 90 × 5/72 × 5 = 450/360 - Add the two like fractions:
300/360 + 450/360 = 300 + 450/360 = 750/360 - 750/360 simplified gives 25/12
- So, 75/90 + 90/72 = 25/12
In mixed form: 21/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: