Add 21/70 and 90/98
21/70 + 90/98 is 597/490.
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,
90/98 = 90 × 5/98 × 5 = 450/490 - Add the two like fractions:
147/490 + 450/490 = 147 + 450/490 = 597/490 - So, 21/70 + 90/98 = 597/490
In mixed form: 1107/490
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+90/98 63/70+90/98