Add 8/21 and 45/40
1st number: 8/21, 2nd number: 1 5/40
8/21 + 45/40 is 253/168.
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,
8/21 = 8 × 40/21 × 40 = 320/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
45/40 = 45 × 21/40 × 21 = 945/840 - Add the two like fractions:
320/840 + 945/840 = 320 + 945/840 = 1265/840 - 1265/840 simplified gives 253/168
- So, 8/21 + 45/40 = 253/168
In mixed form: 185/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+45/40 8/21+90/40 8/42+45/40 8/21+45/80 24/21+45/40 8/63+45/40 40/21+45/40 56/21+45/40