## Reflection: Missing Numbers - Section 4: Independent Practice

The most difficult part of this game is teaching kids to explain how they know the number should go there. However, the explanation is critical to meeting the Common Core mathematical practices standards. CCSS.MP3 says, "Construct viable arguments and critique the reasoning of others."

This lesson allows students to practice agreeing and disagreeing with each other in a developmentally appropriate way. The video attached to the Independent Practice shows a 15 second explanation by a student for why he knew 41 was missing. This is a great example for the depth that is needed as a beginning of the year first grader. He states the missing number, explains how he figured out the missing number, and also states what pattern he noticed on the hundreds chart.

Throughout the lesson, it is critical that students hear this type of explanation modeled by the teacher and by their peers.

"How do you know?": Teaching Kids to Explain
"How do you know?": Teaching Kids to Explain

# Missing Numbers

Unit 2: Count to 100 Every Day!
Lesson 5 of 13

## Big Idea: Young children love a good mystery. This lesson allows them to explore numbers to 100 and how they are structured on a hundreds chart while playing a really fun and engaging Missing Numbers game.

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50 minutes

### Amanda Cole

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