Add 10/21 and 90/12
1st number: 10/21, 2nd number: 7 6/12
10/21 + 90/12 is 335/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
10/21 = 10 × 4/21 × 4 = 40/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
90/12 = 90 × 7/12 × 7 = 630/84 - Add the two like fractions:
40/84 + 630/84 = 40 + 630/84 = 670/84 - 670/84 simplified gives 335/42
- So, 10/21 + 90/12 = 335/42
In mixed form: 741/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+90/12 10/42+90/12 10/21+90/24 30/21+90/12 10/63+90/12 10/21+90/36 50/21+90/12 10/21+90/60 70/21+90/12 10/21+90/84