Answers

Add 21/10 and 81/63

1^st number: 2 1/10, 2^nd number: 1 18/63

21/10 + 81/63 is 237/70.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 10 and 63 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 10 × 63 = 630,
   21/10 = 21 × 63/10 × 63 = 1323/630
3. Likewise, for the 2nd fraction, since 63 × 10 = 630,
   81/63 = 81 × 10/63 × 10 = 810/630
4. Add the two like fractions:
   1323/630 + 810/630 = 1323 + 810/630 = 2133/630
5. 2133/630 simplified gives 237/70
6. So, 21/10 + 81/63 = 237/70
   In mixed form: 327/70

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁴²/₁₀+⁸¹/₆₃ ²¹/₂₀+⁸¹/₆₃ ⁶³/₁₀+⁸¹/₆₃ ²¹/₃₀+⁸¹/₆₃ ²¹/₅₀+⁸¹/₆₃ ²¹/₇₀+⁸¹/₆₃

Add Fractions Calculator