Add 56/42 and 72/21
1st number: 1 14/42, 2nd number: 3 9/21
56/42 + 72/21 is 100/21.
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,
56/42 = 56 × 1/42 × 1 = 56/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
72/21 = 72 × 2/21 × 2 = 144/42 - Add the two like fractions:
56/42 + 144/42 = 56 + 144/42 = 200/42 - 200/42 simplified gives 100/21
- So, 56/42 + 72/21 = 100/21
In mixed form: 416/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/84+72/21 56/42+72/42 56/42+72/63