Add 70/40 and 30/42
1st number: 1 30/40, 2nd number: 30/42
70/40 + 30/42 is 69/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
70/40 = 70 × 21/40 × 21 = 1470/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
30/42 = 30 × 20/42 × 20 = 600/840 - Add the two like fractions:
1470/840 + 600/840 = 1470 + 600/840 = 2070/840 - 2070/840 simplified gives 69/28
- So, 70/40 + 30/42 = 69/28
In mixed form: 213/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40+60/42 70/80+30/42 70/40+30/84 70/40+90/42