Add Three Numbers Lesson 22

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Add Three NumbersLesson 22

• By Risa Udell

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Add Three Numbers

• 3 2 4
• What different ways can we use to find the
  totals?

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Add Three Numbers

• Lets add some combinations of numbers. Show on
  your mathboard, which numbers you add first.
• 4 4 1

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Add Three Numbers

• 3 1
• 4 2 3
• 2 3
• 1 3 5

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Add Three Numbers

• 5 1
• 6 2 1
• 1 4 4

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Totals Greater Than 10

• 2 8 ____
• Try different ways to add the numbers.

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Math Talk

• Why did our three helpers get the same
  answer?
• What are some things you notice about the
  solutions?
• Can you use these strategies with every
  problem?

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Lets do page 67.
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Find Math Mountains With Teen Totals

• Using partners that are less than 10, well be
  writing math mountains with teen totals.
• How many math mountains can you come up with?
• Switching the partners does not make a different
  math mountain.

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Patterns in Teen Math Mountains

• What patterns in the Math Mountains do you see?
• What are some ways to remember them or to find
  them quickly?

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Homework