Add 21/18 and 25/7
1st number: 1 3/18, 2nd number: 3 4/7
21/18 + 25/7 is 199/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
21/18 = 21 × 7/18 × 7 = 147/126 - Likewise, for the 2nd fraction, since 7 × 18 = 126,
25/7 = 25 × 18/7 × 18 = 450/126 - Add the two like fractions:
147/126 + 450/126 = 147 + 450/126 = 597/126 - 597/126 simplified gives 199/42
- So, 21/18 + 25/7 = 199/42
In mixed form: 431/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+25/7 21/18+50/7 21/36+25/7 21/18+25/14 63/18+25/7 21/18+75/7 21/54+25/7 21/18+25/21 21/90+25/7 21/18+25/35 21/18+25/49