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Exploring Number Sentences That Equal 100: Engaging Math Activities

Today, we will explore various number sentences that sum to 100 using addition. You'll need a pencil, your math journal, and a hundred's chart. First, discuss with a partner how many different combinations of two addends can equal 10 and then transition to those that sum to 100. Work through exercises like 50 + ? = 100 and 40 + ? = 100, making connections between addition problems. Predict how many different number sentences can be formed to reach 100, share your reasoning, and work collaboratively to list all possibilities with your partner.

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Exploring Number Sentences That Equal 100: Engaging Math Activities

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Presentation Transcript

  1. Today you will need: • A pencil • Your math journal • A hundred’s chart

  2. You’ve discovered many number sentences for 10.

  3. Discuss with a partner how many different number sentences (with 2 addends) equal 10?

  4. Let’s find some number sentences that equal 100.

  5. 50 + ? = 100

  6. 50 + 50 = 100

  7. How is 50 + 50 = 100 like 5 + 5 = 10?

  8. 40 + ? = 100

  9. 40 + ? = 100

  10. 40 + 60 = 100

  11. How is 40 + 60 = 100 like 4 + 6 =10 ?

  12. Are there any facts that you know that could help you solve 78 + ? = 100?

  13. Predict how many number sentences (with 2 addends) will equal 100? Share with a partner why you think your prediction is correct.

  14. Let’s try it! With a partner, list all of the ways you can get to 100. You may use a hundreds chart if you would like.

  15. We will come back together in a few moments. • Questions to think about……… • Can you share one fact that you found? • How did you figure out the different ways? • Have you named all the possible ways to make 100? How do you know?

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