Add 42/90 and 36/42
42/90 + 36/42 is 139/105.
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,
42/90 = 42 × 7/90 × 7 = 294/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
36/42 = 36 × 15/42 × 15 = 540/630 - Add the two like fractions:
294/630 + 540/630 = 294 + 540/630 = 834/630 - 834/630 simplified gives 139/105
- So, 42/90 + 36/42 = 139/105
In mixed form: 134/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/90+36/42 42/90+72/42 42/90+36/84