Add 21/84 and 18/24
21/84 + 18/24 is 1/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 24 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
21/84 = 21 × 2/84 × 2 = 42/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
18/24 = 18 × 7/24 × 7 = 126/168 - Add the two like fractions:
42/168 + 126/168 = 42 + 126/168 = 168/168 - 168/168 simplified gives 1/1
- So, 21/84 + 18/24 = 1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+18/24 21/84+36/24 21/84+18/48 63/84+18/24 21/84+54/24 21/84+18/72 21/84+90/24