Add 72/42 and 75/21
1st number: 1 30/42, 2nd number: 3 12/21
72/42 + 75/21 is 37/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
72/42 = 72 × 1/42 × 1 = 72/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
75/21 = 75 × 2/21 × 2 = 150/42 - Add the two like fractions:
72/42 + 150/42 = 72 + 150/42 = 222/42 - 222/42 simplified gives 37/7
- So, 72/42 + 75/21 = 37/7
In mixed form: 52/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/84+75/21 72/42+75/42 72/42+75/63