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# Missing Numbers to 50

Lesson 1 of 13

## Objective: SWBAT use patterns on a 50 chart to identify missing numbers.

#### Setting Up the Learning

*5 min*

**Review:**

We have been practicing counting and writing numbers. To get our brains ready, let's do a count to 100 song. Click here for link.

**Connect:**

It is important for us to understand how to write numbers and how to count big numbers because we will use these numbers in problems later on this year.

**Objective: **

What patterns do I notice that will help me figure out missing numbers on the hundreds chart?

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#### Opening Discussion

*15 min*

Today I am going to try my best to trick you!! I am going to cover up a bunch of numbers and see if you can figure out what numbers are missing and then write those numbers in standard form.

Before we do that though, I want us to look closely at the 50 chart.

**Guiding Questions: These questions help students focus on the structure of the 100 chart. They are noticing the structure and then using it to help them identify other missing numbers, which is an example of alignment to MP7, "Look for and make use of structure".**

- What do you notice about how the chart is set up? What do you notice about how the numbers change/stay the same?

**Partner Talk: What other things do you notice about how the chart is set up?**

I'll chart some of the ideas I hear in partners and refer to the class 100 chart.

We noticed so many new things about how the hundreds chart is set up! This is going to help us as we work on reading and writing the numbers to 50. Remember that our thinking job is: **How can I use what I know about a hundreds chart to figure out missing numbers?**

** **

I'll hide 1 number while students close eyes. "What number is missing? How do you know?"

I'll hide 3-4 more numbers and follows the same routine, always having students explain their reasoning for how they are sure. Students are working on MP3, Construct viable arguments and critique the reasoning of others, as they explain their thinking.

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#### Game Practice

*15 min*

**Missing Number Rules:**

- Partner 1 covers up 3 numbers with counters. Partner 2 can’t look!
- Partner 2 opens eyes and guesses a number. Partner 1 shows them the number and says, “How do you know?” or “No, the answer was ___”.
- Partner 2 guesses all the other numbers. Partner 1 has to ask “How do you know” or “No the answer was…”
- Record the numbers that were hiding in standard form.
- Switch! Keep playing until time is up!

I'll model a few rounds on the class hundreds chart, emphasizing the How do you know part. I'll reference the chart from earlier-“I see you know that all the numbers on this row start with a 2-we noticed that earlier on our chart”.

**Guiding Questions:**

- What did ___ do to figure out the missing number?
- Is there another way you can know for sure that is the number?
- How would we write that number?

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#### Game Time!

*15 min*

Students play the game using different hundreds chart based on their current understanding.

**Group A: In need of intervention**

These students will use a number chart to 30. Click here for a 30 chart!

**Group B: Right on Track**

These students will use a number chart to 50. Go here for a 50 chart!

**Group C: Extension**

These students will use a number chart to 100.Go here for 100 chart!

**See attached video of 2 students in Group C playing the game together. (Warning: It's adorable!)**

**See attached document for the recording sheet!**

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#### Closing

*5 min*

Today’s thinking job was: How can I use what I know about the hundreds chart to help me figure out missing numbers?

I'll play one more round with students and closes out the day.

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- UNIT 1: Creating a Culture of Math
- UNIT 2: Count to 100 Every Day!
- UNIT 3: 10: A First Grader's Best Friend
- UNIT 4: Charting and Analyzing Data
- UNIT 5: Inch by Inch, Paperclip by Paperclip
- UNIT 6: Properties of Addition and Subtraction
- UNIT 7: Shapes and Blocks
- UNIT 8: Understanding Equality
- UNIT 9: Adding and Subtracting: Base Ten
- UNIT 10: Solving 3 Addend Problems
- UNIT 11: Missing Parts: Unknowns in All Positions
- UNIT 12: Parts of a Whole
- UNIT 13: Tick Tock, Tick Tock
- UNIT 14: Time is Money: Hitting all the MD Standards
- UNIT 15: Base 10 Bonanza
- UNIT 16: What the WHAT?! Teaching Challenging Story Problems

- LESSON 1: Missing Numbers to 50
- LESSON 2: Counting Strips
- LESSON 3: One Less!
- LESSON 4: One More/One Less Hop
- LESSON 5: Missing Numbers
- LESSON 6: Number Puzzles
- LESSON 7: Counting Collections
- LESSON 8: Counting Collections: 100 Objects
- LESSON 9: Constructing Tens and Ones
- LESSON 10: Building Tens at the Lego Factory
- LESSON 11: It's Elementary My Dear Watson
- LESSON 12: Down on the Farm: Base 10 Problems
- LESSON 13: WANTED: Runaway Number