Add 98/18 and 75/21
1st number: 5 8/18, 2nd number: 3 12/21
98/18 + 75/21 is 568/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
98/18 = 98 × 7/18 × 7 = 686/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
75/21 = 75 × 6/21 × 6 = 450/126 - Add the two like fractions:
686/126 + 450/126 = 686 + 450/126 = 1136/126 - 1136/126 simplified gives 568/63
- So, 98/18 + 75/21 = 568/63
In mixed form: 91/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/36+75/21 98/18+75/42 98/54+75/21 98/18+75/63 98/90+75/21