Add 72/15 and 40/42
1st number: 4 12/15, 2nd number: 40/42
72/15 + 40/42 is 604/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
72/15 = 72 × 14/15 × 14 = 1008/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
40/42 = 40 × 5/42 × 5 = 200/210 - Add the two like fractions:
1008/210 + 200/210 = 1008 + 200/210 = 1208/210 - 1208/210 simplified gives 604/105
- So, 72/15 + 40/42 = 604/105
In mixed form: 579/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/15+80/42 72/30+40/42 72/15+40/84 72/45+40/42 72/75+40/42