Add 84/42 and 12/40
1st number: 2 0/42, 2nd number: 12/40
84/42 + 12/40 is 23/10.
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,
84/42 = 84 × 20/42 × 20 = 1680/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
12/40 = 12 × 21/40 × 21 = 252/840 - Add the two like fractions:
1680/840 + 252/840 = 1680 + 252/840 = 1932/840 - 1932/840 simplified gives 23/10
- So, 84/42 + 12/40 = 23/10
In mixed form: 23/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/42+24/40 84/42+12/80 84/42+36/40 84/42+60/40 84/42+84/40