THE BIG IDEAS OF ADDITION AND SUBTRACTION

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# THE BIG IDEAS OF ADDITION AND SUBTRACTION - PowerPoint PPT Presentation

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## THE BIG IDEAS OF ADDITION AND SUBTRACTION

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### THE BIG IDEAS OFADDITION AND SUBTRACTION

• More ice cream
• More ice cream
• More ice cream
• 12 blue flowers and 7 red flowers
• More ice cream
• 12 blue flowers and 7 red flowers
• 6 forks, 8 spoons, and 2 knives
Writing it Down

3 5

• + 5 = 8

The Equal Sign

3 + 5 = 8

8 = 3 + 5

The Equal Sign

3 + 5 = 8

8 = 3 + 5

2 + 6 = 7 + 1

The Equal Sign

3 + 5 = 8

8 = 3 + 5

2 + 6 = 7 + 1

WHAT IS SUBTRACTION?
• Take away

Malik had 9 marbles. He lost 5 marbles. How many marbles does he have now?

How many more does he have?

Show how you know who has more cookies.

3 Different Subtraction Problems
• I had 5 slices of pizza on my plate. The dog ate 2 slices. How many slices do I have now?
3 Different Subtraction Problems
• I had 5 slices of pizza on my plate. The dog ate 2 slices. How many slices do I have now?
• Marcus has 7 baseball cards. Ricardo has 12 baseball cards. How many more cards does Ricardo have?
3 Different Subtraction Problems
• I had 5 slices of pizza on my plate. The dog ate 2 slices. How many slices do I have now?
• Marcus has 7 baseball cards. Ricardo has 12 baseball cards. How many more cards does Ricardo have?
• Maria is saving to buy a toy. She has saved \$17. The toy costs \$29. How much more does she need to save?
Fact Families

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11

+,

8 3

• That we use addition and subtraction to solve real problems.
• That we use addition and subtraction to solve real problems.
• That addition and subtraction are connected.
• That we use addition and subtraction to solve real problems.
• That addition and subtraction are connected.
• That addition gives us the total. The whole amount.
• That we use addition and subtraction to solve real problems.
• That addition and subtraction are connected.
• That addition gives us the total; the whole amount.
• That subtraction helps us find a part; what is left, what is missing.