Join Result Unknown

Connie had 5 marbles. Juan gave her 8 more marbles.

How many marbles does Connie have altogether?

Modeling:

Strategy: Join all
5 + 8 = ?

Counting:

Strategy: Count on from first
5 + 8 = ?


Strategy: Count on from largest
8 + 5 = ?

Derived Facts:

Strategy: Number Facts
8 = 5 + 3 (decompose the 8)
5 + 5 --->10 + 3 ---> 13