Add 4/42 and 20/90
4/42 + 20/90 is 20/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
4/42 = 4 × 15/42 × 15 = 60/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
20/90 = 20 × 7/90 × 7 = 140/630 - Add the two like fractions:
60/630 + 140/630 = 60 + 140/630 = 200/630 - 200/630 simplified gives 20/63
- So, 4/42 + 20/90 = 20/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42+20/90 4/42+40/90 4/84+20/90 12/42+20/90 4/42+60/90 20/42+20/90 28/42+20/90