Add 5/42 and 20/40
5/42 + 20/40 is 13/21.
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,
5/42 = 5 × 20/42 × 20 = 100/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
20/40 = 20 × 21/40 × 21 = 420/840 - Add the two like fractions:
100/840 + 420/840 = 100 + 420/840 = 520/840 - 520/840 simplified gives 13/21
- So, 5/42 + 20/40 = 13/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/42+20/40 5/84+20/40 5/42+20/80 15/42+20/40 5/42+60/40 25/42+20/40 35/42+20/40