Add 42/45 and 12/40
42/45 + 12/40 is 37/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 45 × 8 = 360,
42/45 = 42 × 8/45 × 8 = 336/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
12/40 = 12 × 9/40 × 9 = 108/360 - Add the two like fractions:
336/360 + 108/360 = 336 + 108/360 = 444/360 - 444/360 simplified gives 37/30
- So, 42/45 + 12/40 = 37/30
In mixed form: 17/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45+12/40 42/45+24/40 42/90+12/40 42/45+12/80 42/45+36/40 42/45+60/40 42/45+84/40