Add 70/42 and 80/40
1st number: 1 28/42, 2nd number: 2 0/40
70/42 + 80/40 is 11/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
70/42 = 70 × 20/42 × 20 = 1400/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
80/40 = 80 × 21/40 × 21 = 1680/840 - Add the two like fractions:
1400/840 + 1680/840 = 1400 + 1680/840 = 3080/840 - 3080/840 simplified gives 11/3
- So, 70/42 + 80/40 = 11/3
In mixed form: 32/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/84+80/40