Add 20/42 and 5/40
20/42 + 5/40 is 101/168.
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,
20/42 = 20 × 20/42 × 20 = 400/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
5/40 = 5 × 21/40 × 21 = 105/840 - Add the two like fractions:
400/840 + 105/840 = 400 + 105/840 = 505/840 - 505/840 simplified gives 101/168
- So, 20/42 + 5/40 = 101/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42+5/40 20/42+10/40 20/84+5/40 20/42+5/80 60/42+5/40 20/42+15/40 20/42+25/40 20/42+35/40