Separate+Change+Unknown

= 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