Use the inverse relationship between addition and subtraction to solve problems.
(How much more than. How much less than. Mystery number.)
Mystery Number: What number must be put into the space to make a correct number sentence?
1. 
2 
+ 
= 
5 

2. 
4 
+ 
= 
3 

3. 
3 
+ 
= 
0 

4. 
2 
+ 
= 
1 

5. 
6 
+ 
= 
4 
1. 
5 
 
2 
= 

2. 
4 
 
3 
= 

3. 
3 
 
0 
= 

4. 
2 
 
1 
= 

5. 
6 
 
4 
= 
Did you notice any pattern between the problems in the two columns?
Use the inverse relationship between addition and subtraction to solve problems.
(How much more than. How much less than. Mystery number.)