Lesson 4

Counting On to Add

Est. Class Sessions: 1

Developing the Lesson

Part 1: Counting On with Cubes

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Small cups may only hold 2 or 3 connecting cubes. If small cups are the only ones available, use smaller counters, such as beans or pennies.

Hold up a large opaque cup and drop six connecting cubes inside. Put it down and place three more cubes next to the cup. On chart paper, write: "Six cubes in the cup and three cubes outside the cup are _____ cubes altogether."

Ask:

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  • How many cubes are there altogether? (9 cubes)
  • Show or tell how you solved this problem. (Possible response: I knew there were six cubes in the cup so I started at 6 and counted on 7, 8, 9 for the three cubes next to the cup.)
  • Write a number sentence for this problem. (6 + 3 = 9)

If students do not suggest a counting-on strategy, ask a volunteer to demonstrate it for the class. Record the answer "nine" in words in the blank. Record the number sentence 6 + 3 = 9 next to the word sentence.

Some students may need to count all the cubes. Take the six cubes out of the cup and put them next to the three cubes. Then ask a student to count them.

Repeat this procedure several more times, each time writing the words on the chart, having the students count on with you, and adding the full number sentence to the chart. Display the chart so students can refer to it throughout the lesson.

Adventure Book:
Student Activity Book:
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Master: