Answer :

To find the sum of 21 and 22, follow these steps:

1. Start with the first number:
- The first number is 21.

2. Add the second number to the first number:
- The second number is 22.
- To add these two numbers together, you combine them as follows:

```
21
+ 22
_____
```

3. Add the units place:
- The units place of the first number (21) is 1.
- The units place of the second number (22) is 2.
- Adding these together: [tex]\( 1 + 2 = 3 \)[/tex].

4. Add the tens place:
- The tens place of the first number (21) is 2.
- The tens place of the second number (22) is 2.
- Adding these together: [tex]\( 2 + 2 = 4 \)[/tex].

5. Combine the results of the addition:
- The final result from adding the units place is 3.
- The final result from adding the tens place is 4.
- Put these results together, you get 43.

So, the sum of 21 and 22 is 43.