Add 42/84 and 2/21
42/84 + 2/21 is 25/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
42/84 = 42 × 1/84 × 1 = 42/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
2/21 = 2 × 4/21 × 4 = 8/84 - Add the two like fractions:
42/84 + 8/84 = 42 + 8/84 = 50/84 - 50/84 simplified gives 25/42
- So, 42/84 + 2/21 = 25/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+4/21 42/84+2/42 42/84+6/21 42/84+2/63 42/84+10/21 42/84+14/21