Add 12/70 and 40/90
12/70 + 40/90 is 194/315.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
12/70 = 12 × 9/70 × 9 = 108/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
40/90 = 40 × 7/90 × 7 = 280/630 - Add the two like fractions:
108/630 + 280/630 = 108 + 280/630 = 388/630 - 388/630 simplified gives 194/315
- So, 12/70 + 40/90 = 194/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/70+40/90 12/70+80/90 36/70+40/90 60/70+40/90 84/70+40/90