Add 12/42 and 10/90
12/42 + 10/90 is 25/63.
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,
12/42 = 12 × 15/42 × 15 = 180/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
10/90 = 10 × 7/90 × 7 = 70/630 - Add the two like fractions:
180/630 + 70/630 = 180 + 70/630 = 250/630 - 250/630 simplified gives 25/63
- So, 12/42 + 10/90 = 25/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/42+10/90 12/42+20/90 12/84+10/90 36/42+10/90 12/42+30/90 60/42+10/90 12/42+50/90 84/42+10/90 12/42+70/90