Part-Part+Whole+Part+Unknown

= Part-Part Whole/ Part Unknown =

Problem: Connie as 13 marbles. Five are red and the rest are blue. How many blue marbles does Connie have?

Direct Modeling and Counting Strategies: There is not a commonly used strategy corresponding to the action or relationship. Children generally use the Joining To, Separating From, Counting On To, or Counting Down.

Join to:
5 + ? = 13 Students add blue cubes until they get to 13.



Separate to:
13 - ? = 5 Students separate the cubes until there are 5. Then they go back and count and see that there are 8 that would be blue.

Separate from: 13 - 5 = ? Students start with 13 cubes and separate 5 cubes from them. They count the remaining cubes to see that there are 8.

Counting
Counting Up to

Counting Down to

Counting Down to