Add 72/24 and 42/40
1st number: 3 0/24, 2nd number: 1 2/40
72/24 + 42/40 is 81/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 24 × 5 = 120,
72/24 = 72 × 5/24 × 5 = 360/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
42/40 = 42 × 3/40 × 3 = 126/120 - Add the two like fractions:
360/120 + 126/120 = 360 + 126/120 = 486/120 - 486/120 simplified gives 81/20
- So, 72/24 + 42/40 = 81/20
In mixed form: 41/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/24+84/40 72/48+42/40 72/24+42/80