Arithmetic with integers (Day 1)

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# Arithmetic with integers (Day 1) - PowerPoint PPT Presentation

Arithmetic with integers (Day 1). Add, subtract, multiply, and divide. Why do I need this?. Integers are used in money, sports, Jeopardy, battle strategies, and give and take. California State standard: NS 1.2: Add integers AF 1.3: Simplify expressions High school exit exam (CAHSEE) .

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### Arithmetic with integers (Day 1)

Why do I need this?
• Integers are used in money, sports, Jeopardy, battle strategies, and give and take.
• California State standard:

AF 1.3: Simplify expressions

• High school exit exam (CAHSEE)
Silently, on your paper name 4 opposites

What is the math opposites?

What would be the opposite of 3?

Think don’t speak

-3 :When you add opposites you will always get 0.

A

B

The heroes are the _____ because…

The villains are the _____ because…

When you are adding and/or subtracting integers* pretend that you have heroes and villains.

*Integer: all whole numbers and their opposites

Ex: {…, -3. -2.00, -1, 0, 1, 4/2, 3, …}

Non examples: {3.4, 3.987, ½, ¼, etc}

Examples:

4+ -3 is the same as 4 heroes and 3 villains after they fight what happens (whenever a villain and a hero fight each other they both are eliminated)

• In Heroes and Villains explain what these look like
• -4 + 5
• 3 + 2
• -4 + -5
• 4 – 5
• -5 – 2

Turn to your neighbor and see if you have the same explanations.

4+ -3 is the same as 4 heroes and 3 villains after they fight what happens (whenever a villain and a hero fight each other they both are eliminated)

The Heroes win, there will be one Hero left.

4 + -3 = 1

• Do the next problems on your own:
• -4 + 5
• 3 + 2
• -4 + -5
• 7 – 9
• -3 – 2