If you have ten counters numbered $1$ to $10$, how many can you put into pairs that add to $10$?

Can you use them all?
Say how you got your answer.
 
 

Now put the counters into pairs to make $12$.

• Can you use them all?
• Say how you got your answer.

Now put the counters into pairs to make $13$.

• Can you use them all?
• Say how you got your answer.

Now put the counters into pairs to make $11$.

• Can you use them all?
• Say how you got your answer.