1. ATN Inv. 2.2b: Extending Subtraction to Rational Numbers
Come in and sit quietly.
Learning Target: I will explore the Commutative Property & Absolute Value while representing differences of rational numbers.
Homework: Solve the problems on THE BOTTOM HALF OF p. 11 of the packet for Investigation 2.2 DAY 4
and CORRECT with the EDpuzzle.
Complete this Warm-up in your notebook:
Give three examples of Additive Inverses:
Possible answers:
‾ 1, ,000 = 0
‾9.837 = 0
‾ ⅜ + ⅜ = 0
Additive Inverses: Two numbers, when added together, equal 0.

2. Vocab Toolkit review:

3. Same signs
Different signs
Remember:
“Don’t subtract…
add the opposite”
Change a subtraction expression to an addition by adding the opposite of the second number.

4. Remember:
“Don’t subtract…
add the opposite”

5. -10 – 5
-10 – 5
= = 15
= = 15

7. because you can’t change the orderNo No No No
No! Subtraction is NOT commutative!
because you can’t change the order
and get the same answer.

8. The thermometer reads –4°F when Allison checks it in the morning and +7°F when she checks it at noon.
What is the change in temperature over the course of the morning?

9. b. Stephanie spends $20 to buy ingredients for baked goods to sell at the bake sale. Her profit is $30.
How much does she sell her baked goods for?
Or: Matt writes a check for $20. Then he makes a deposit. He ends up with $30 more than he had before writing the check.
How much does he deposit?

10. In Math Fever, Jacob answered his first two questions incorrectly
In Math Fever, Jacob answered his first two questions incorrectly. The second question was worth 150 points. His current score is –450.
What was the point value of his first question?

11. ATN Inv. 2.2a: Extending Subtraction to Rational Numbers
Remember:
“Don’t subtract…
add the opposite”
Did I reach my Learning Target?
I will explore the Commutative Property & Absolute Value while representing differences of rational numbers.
Homework: Solve the problems on THE BOTTOM HALF OF p. 11 of the packet for Investigation 2.2 DAY 3
and CORRECT with the EDpuzzle.