Add 20/40 and 50/42
1st number: 20/40, 2nd number: 1 8/42
20/40 + 50/42 is 71/42.
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,
20/40 = 20 × 21/40 × 21 = 420/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
50/42 = 50 × 20/42 × 20 = 1000/840 - Add the two like fractions:
420/840 + 1000/840 = 420 + 1000/840 = 1420/840 - 1420/840 simplified gives 71/42
- So, 20/40 + 50/42 = 71/42
In mixed form: 129/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/80+50/42 20/40+50/84 60/40+50/42