THE BIG IDEAS OF ADDITION AND SUBTRACTION. WHAT IS ADDITION?

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Presentation transcript:

THE BIG IDEAS OF ADDITION AND SUBTRACTION

WHAT IS ADDITION?

We add quantities: –More ice cream

WHAT IS ADDITION? We add quantities: –More ice cream –3 cookies and 5 cookies (5 cookies and 3 cookies)

WHAT IS ADDITION? We add quantities: –More ice cream –3 cookies and 5 cookies (5 cookies and 3 cookies) –12 blue flowers and 7 red flowers

WHAT IS ADDITION? We add quantities: –More ice cream –3 cookies and 5 cookies (5 cookies and 3 cookies) –12 blue flowers and 7 red flowers –6 forks, 8 spoons, and 2 knives

Writing it Down = 8 8 cookies

The Equal Sign = 8

The Equal Sign = 8 8 = 3 + 5

The Equal Sign = 8 8 = = 7 + 1

The Equal Sign = 8 8 = = 7 + 1

WHAT IS SUBTRACTION?

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

Which operation is this?

Juan has 14 cookies. Mike has 9 cookies. Who has more cookies? How many more does he have? Show how you know who has more cookies.

3 Different Subtraction Problems 1.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 1.I had 5 slices of pizza on my plate. The dog ate 2 slices. How many slices do I have now? 2.Marcus has 7 baseball cards. Ricardo has 12 baseball cards. How many more cards does Ricardo have?

3 Different Subtraction Problems 1.I had 5 slices of pizza on my plate. The dog ate 2 slices. How many slices do I have now? 2.Marcus has 7 baseball cards. Ricardo has 12 baseball cards. How many more cards does Ricardo have? 3.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 * 11 +, 8 3

WHAT DO WE WANT STUDENTS TO KNOW ABOUT ADDITION AND SUBTRACTION? That we use addition and subtraction to solve real problems.

WHAT DO WE WANT STUDENTS TO KNOW ABOUT ADDITION AND SUBTRACTION? That we use addition and subtraction to solve real problems. That addition and subtraction are connected.

WHAT DO WE WANT STUDENTS TO KNOW ABOUT ADDITION AND SUBTRACTION? 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.

WHAT DO WE WANT STUDENTS TO KNOW ABOUT ADDITION AND SUBTRACTION? 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. That “adding on” or “adding up” gives the same answer as subtraction.