Separate Change Unknown

Connie had 13 marbles. She gave some to Juan. Now she has 5 marbles left. How many marbles did Connie give to Juan?

Direct Modeling:

Strategy:
Separate To
13-?=5








Modeling:

Strategy:
Join To
5+? =13













Strategy:
Separate From
13-5=?












Counting:




Strategy:
Count Down
3-5=?










Strategy:
Count Up To
5+?=13









Strategy:
Count Down To:
13-?=5







Facts:

Strategy:
Derived Facts
I Know 13=10+3, so 10-->-5-->5+3-->8