Add 21/42 and 75/9
1st number: 21/42, 2nd number: 8 3/9
21/42 + 75/9 is 53/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
21/42 = 21 × 3/42 × 3 = 63/126 - Likewise, for the 2nd fraction, since 9 × 14 = 126,
75/9 = 75 × 14/9 × 14 = 1050/126 - Add the two like fractions:
63/126 + 1050/126 = 63 + 1050/126 = 1113/126 - 1113/126 simplified gives 53/6
- So, 21/42 + 75/9 = 53/6
In mixed form: 85/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/84+75/9 21/42+75/18 63/42+75/9 21/42+75/27 21/42+75/45 21/42+75/63