Add 84/2 and 70/21
1st number: 42 0/2, 2nd number: 3 7/21
84/2 + 70/21 is 136/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
84/2 = 84 × 21/2 × 21 = 1764/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
70/21 = 70 × 2/21 × 2 = 140/42 - Add the two like fractions:
1764/42 + 140/42 = 1764 + 140/42 = 1904/42 - 1904/42 simplified gives 136/3
- So, 84/2 + 70/21 = 136/3
In mixed form: 451/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/4+70/21 84/2+70/42 84/6+70/21 84/2+70/63 84/10+70/21 84/14+70/21