Add 70/21 and 8/12
1st number: 3 7/21, 2nd number: 8/12
70/21 + 8/12 is 4/1.
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,
70/21 = 70 × 4/21 × 4 = 280/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
8/12 = 8 × 7/12 × 7 = 56/84 - Add the two like fractions:
280/84 + 56/84 = 280 + 56/84 = 336/84 - 336/84 simplified gives 4/1
- So, 70/21 + 8/12 = 4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+16/12 70/42+8/12 70/21+8/24 70/21+24/12 70/63+8/12 70/21+8/36 70/21+40/12 70/21+8/60 70/21+56/12 70/21+8/84