Add 21/75 and 18/21
21/75 + 18/21 is 199/175.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 21 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 75 × 7 = 525,
21/75 = 21 × 7/75 × 7 = 147/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
18/21 = 18 × 25/21 × 25 = 450/525 - Add the two like fractions:
147/525 + 450/525 = 147 + 450/525 = 597/525 - 597/525 simplified gives 199/175
- So, 21/75 + 18/21 = 199/175
In mixed form: 124/175
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75+18/21 21/75+36/21 21/75+18/42 63/75+18/21 21/75+54/21 21/75+18/63 21/75+90/21