Add 42/12 and 21/42
1st number: 3 6/12, 2nd number: 21/42
42/12 + 21/42 is 4/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
42/12 = 42 × 7/12 × 7 = 294/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
21/42 = 21 × 2/42 × 2 = 42/84 - Add the two like fractions:
294/84 + 42/84 = 294 + 42/84 = 336/84 - 336/84 simplified gives 4/1
- So, 42/12 + 21/42 = 4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12+21/42 42/24+21/42 42/12+21/84 42/12+63/42 42/36+21/42 42/60+21/42 42/84+21/42