Add 72/40 and 15/42
1st number: 1 32/40, 2nd number: 15/42
72/40 + 15/42 is 151/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
72/40 = 72 × 21/40 × 21 = 1512/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
15/42 = 15 × 20/42 × 20 = 300/840 - Add the two like fractions:
1512/840 + 300/840 = 1512 + 300/840 = 1812/840 - 1812/840 simplified gives 151/70
- So, 72/40 + 15/42 = 151/70
In mixed form: 211/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/40+30/42 72/80+15/42 72/40+15/84 72/40+45/42 72/40+75/42