Add 30/90 and 3/42
30/90 + 3/42 is 17/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
30/90 = 30 × 7/90 × 7 = 210/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
3/42 = 3 × 15/42 × 15 = 45/630 - Add the two like fractions:
210/630 + 45/630 = 210 + 45/630 = 255/630 - 255/630 simplified gives 17/42
- So, 30/90 + 3/42 = 17/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/90+3/42 30/90+6/42 30/90+3/84 30/90+9/42 30/90+15/42 30/90+21/42