This document shows a series of addition problems with the numbers 2, 1, and 3. It adds up combinations of those numbers on separate lines and shows the equals sign after each one is calculated to equal a total. The document does not provide any other context around the meaning or purpose.

1. 2 + 1
2
1
3
+
=
3 + 2
+
=
4 + 0
+
=
2 + 2
+
=
1 + 3
+
=
2 + 3
+
=
NOM: ___________________________
DATA: ___________________________