Add 18/21 and 42/75
18/21 + 42/75 is 248/175.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 75 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
18/21 = 18 × 25/21 × 25 = 450/525 - Likewise, for the 2nd fraction, since 75 × 7 = 525,
42/75 = 42 × 7/75 × 7 = 294/525 - Add the two like fractions:
450/525 + 294/525 = 450 + 294/525 = 744/525 - 744/525 simplified gives 248/175
- So, 18/21 + 42/75 = 248/175
In mixed form: 173/175
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+42/75 18/21+84/75 18/42+42/75 54/21+42/75 18/63+42/75 90/21+42/75