Practice finding missing numbers in addition and subtraction equations.

To find the missing numbers, we can use inverse operations. This means if you have an addition problem, you can use subtraction to find the missing part. If you have a subtraction problem, you can use addition.

Here is the step-by-step solution for each problem:

1. $4\square + 15 = 56$
* Think: $56 - 15 = ?$
* $6 - 5 = 1$
* $5 - 1 = 4$
* The missing number is 1. (Check: $41 + 15 = 56$)

2. $\square5 - 43 = 52$
* Think: $52 + 43 = ?$
* $2 + 3 = 5$
* $5 + 4 = 9$
* The missing number is 9. (Check: $95 - 43 = 52$)

3. $25 + 1\square = 39$
* Think: $39 - 25 = ?$ or just look at the ones place: $5 + \square = 9$.
* $9 - 5 = 4$
* The missing number is 4. (Check: $25 + 14 = 39$)

4. $22 + \square5 = 57$
* Look at the tens place: $2 + \square = 5$.
* $5 - 2 = 3$
* The missing number is 3. (Check: $22 + 35 = 57$)

5. $2\square - 12 = 15$
* Think: $15 + 12 = ?$
* $5 + 2 = 7$
* $1 + 1 = 2$
* The missing number is 7. (Check: $27 - 12 = 15$)

6. $7\square - 43 = 32$
* Look at the ones place: $\square - 3 = 2$.
* What number minus 3 equals 2? It is 5.
* The missing number is 5. (Check: $75 - 43 = 32$)

7. $\square1 - 41 = 10$
* Think: $10 + 41 = ?$
* $0 + 1 = 1$
* $1 + 4 = 5$
* The missing number is 5. (Check: $51 - 41 = 10$)

8. $\square9 - 59 = 00$
* Think: $0 + 59 = ?$
* The answer must be 59 because subtracting 59 from itself gives zero.
* The missing number is 5. (Check: $59 - 59 = 0$)

9. $21 + 4\square = 65$
* Look at the ones place: $1 + \square = 5$.
* $5 - 1 = 4$
* The missing number is 4. (Check: $21 + 44 = 65$)

Final Answer:
The missing numbers are:
1. 1
2. 9
3. 4
4. 3
5. 7
6. 5
7. 5
8. 5
9. 4