Add 21/2 and 18/42
1st number: 10 1/2, 2nd number: 18/42
21/2 + 18/42 is 153/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
21/2 = 21 × 21/2 × 21 = 441/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
18/42 = 18 × 1/42 × 1 = 18/42 - Add the two like fractions:
441/42 + 18/42 = 441 + 18/42 = 459/42 - 459/42 simplified gives 153/14
- So, 21/2 + 18/42 = 153/14
In mixed form: 1013/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+18/42 21/2+36/42 21/4+18/42 21/2+18/84 63/2+18/42 21/2+54/42 21/6+18/42 21/2+90/42 21/10+18/42 21/14+18/42