Identify common denominator: Identify the common denominator for 21 and 41. The common denominator is 4 because it is the least common multiple of 2 and 4.
Convert to equivalent fraction: Convert 21 to an equivalent fraction with the denominator of 4. To do this, multiply both the numerator and the denominator of 21 by 2. This gives us 42.
Add fractions with common denominator: Add the two fractions with the common denominator. Now we have 42 (from step 2) and 41. Adding these together gives us 4(2+1).
Perform addition in numerator: Perform the addition in the numerator. 2+1 equals 3. So, we have 43.
More problems from Add and subtract rational numbers