Download AN Inv 3.3 McGrath Div of Rational Numbers

Math CC7/8 – Be Prepared
On Desk:
1. Pencil
2. *Math Journal
3. Learning Log
Learning Log:
1. HW: p.71, #42 a-r, #44 a-l
2. Pass back SD Test Retakesdue back by Monday!
3. Learning Check #2 today!
4. AN Quiz – Tomorrow!
*Get ready for a Warm Up in your journal!
Tasks for Today
• Warm Up
• Lesson 3.3 – Division of Rational
Numbers – Day 2
• AN Learning Check #2 –Inv. 3 (6pts.)
Warm Up
Copy and solve the following problems in your journal…
1) 1.8 + - 3.3 = -1.5
4) -3.28 ÷ 4 = -0.82
2) -17 – 23 = -40
2
1
1
5) - 3 ÷ - 1 5 = +2 3
5
3) 4.2 (-3) = -12.6
Billy owes the candy store $99. His 3 friends
offer to pay his debt equally among the 3 of
them. Write a number sentence to show how
much each friend owes.
No! Division in NOT commutative.
When you change the order, you get
quotients that are multiplicative inverses
of one another!
Adding zero to ANY rational number does NOT
change the value of the number.
Yes! The multiplicative identity is 1.
The sum of a number and
its opposite (additive
inverse) is always zero!
Zero is its own
additive inverse.
Each nonzero rational number has
a multiplicative inverse.
It is the reciprocal of the number.
A number times its multiplicative
inverse is equal to one!
Commutative Property of Multiplication
Multiplicative Inverse Property
Multiplicative Identity
Dividing Integers - Rules
Positive ÷ Positive = Positive
Positive ÷ Negative = Negative
Negative ÷ Positive = Negative
Negative ÷ Negative = Positive
Multiplying Integers - Rules
Positive x Positive = Positive
Positive x Negative = Negative
Negative x Positive = Negative
Negative x Negative = Positive
AN Learning Check #2 (Inv. 3)