Add 80/40 and 50/42
1st number: 2 0/40, 2nd number: 1 8/42
80/40 + 50/42 is 67/21.
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,
80/40 = 80 × 21/40 × 21 = 1680/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
50/42 = 50 × 20/42 × 20 = 1000/840 - Add the two like fractions:
1680/840 + 1000/840 = 1680 + 1000/840 = 2680/840 - 2680/840 simplified gives 67/21
- So, 80/40 + 50/42 = 67/21
In mixed form: 34/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/40+50/84