Add 81/98 and 90/70
1st number: 81/98, 2nd number: 1 20/70
81/98 + 90/70 is 207/98.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 98 and 70 is 490
Next, find the equivalent fraction of both fractional numbers with denominator 490 - For the 1st fraction, since 98 × 5 = 490,
81/98 = 81 × 5/98 × 5 = 405/490 - Likewise, for the 2nd fraction, since 70 × 7 = 490,
90/70 = 90 × 7/70 × 7 = 630/490 - Add the two like fractions:
405/490 + 630/490 = 405 + 630/490 = 1035/490 - 1035/490 simplified gives 207/98
- So, 81/98 + 90/70 = 207/98
In mixed form: 211/98
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: