What is the sum of 8 and 5?

Question

8
+5
-----
13

We have 13 _ pieces
A group of 10 of these ones pieces can be traded in for a _ piece.
1 ten plus 3 ones is equivalent to _.

Answer 1

The sum of 8 and 5 is indeed 13.

We have 13 ones pieces.
A group of 10 of these ones pieces can be traded in for a ten piece.
1 ten plus 3 ones is equivalent to 13.