Add 12/42 and 8/40
12/42 + 8/40 is 17/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
12/42 = 12 × 20/42 × 20 = 240/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
8/40 = 8 × 21/40 × 21 = 168/840 - Add the two like fractions:
240/840 + 168/840 = 240 + 168/840 = 408/840 - 408/840 simplified gives 17/35
- So, 12/42 + 8/40 = 17/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/42+8/40 12/42+16/40 12/84+8/40 12/42+8/80 36/42+8/40 12/42+24/40 60/42+8/40 84/42+8/40 12/42+56/40