A. Part-Whole Diagram 
Fill in the diagram and write a
number sentence. Write or draw a picture of a story to match. Use
cubes, a number line, or ten frame.
Lesson 1
Combining and Partitioning
Est. Class Sessions: 2–3Daily Practice and Problems
Teacher Notes
X
A possible number story: Tanya had 6 marbles. She found 4 more. Then she had 10 marbles.
Possible picture:
Ask students to explain their strategy.