Add 21/70 and 84/98
21/70 + 84/98 is 81/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 98 is 490
Next, find the equivalent fraction of both fractional numbers with denominator 490 - For the 1st fraction, since 70 × 7 = 490,
21/70 = 21 × 7/70 × 7 = 147/490 - Likewise, for the 2nd fraction, since 98 × 5 = 490,
84/98 = 84 × 5/98 × 5 = 420/490 - Add the two like fractions:
147/490 + 420/490 = 147 + 420/490 = 567/490 - 567/490 simplified gives 81/70
- So, 21/70 + 84/98 = 81/70
In mixed form: 111/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+84/98 63/70+84/98