Add 21/5 and 9/72
1st number: 4 1/5, 2nd number: 9/72
21/5 + 9/72 is 173/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 5 × 72 = 360,
21/5 = 21 × 72/5 × 72 = 1512/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
9/72 = 9 × 5/72 × 5 = 45/360 - Add the two like fractions:
1512/360 + 45/360 = 1512 + 45/360 = 1557/360 - 1557/360 simplified gives 173/40
- So, 21/5 + 9/72 = 173/40
In mixed form: 413/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+9/72 21/5+18/72 21/10+9/72 63/5+9/72 21/5+27/72 21/15+9/72 21/5+45/72 21/25+9/72 21/5+63/72 21/35+9/72