Add 12/21 and 4/40
12/21 + 4/40 is 47/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
12/21 = 12 × 40/21 × 40 = 480/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
4/40 = 4 × 21/40 × 21 = 84/840 - Add the two like fractions:
480/840 + 84/840 = 480 + 84/840 = 564/840 - 564/840 simplified gives 47/70
- So, 12/21 + 4/40 = 47/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+4/40 12/21+8/40 12/42+4/40 12/21+4/80 36/21+4/40 12/21+12/40 12/63+4/40 60/21+4/40 12/21+20/40 84/21+4/40 12/21+28/40