Section 3.5 Multiplying and Dividing Integers. Mult./Dividing Integer Rules  1. When you mult./or divide 2 integers with the same sign, the product (the.

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Multiplying and Dividing Integers

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Presentation transcript:

Section 3.5 Multiplying and Dividing Integers

Mult./Dividing Integer Rules  1. When you mult./or divide 2 integers with the same sign, the product (the answer) is positive.  Example: 2 x 5= 10 same sign  -2 x -5 = 10 same sign

Your turn  -3 x -3= _____ same sign?  2 x 2 = ______ same or diff signs?  -6 x -1 = _____  -5 x -2 = _____

Rule # 2  When you mult. Or divide 2 integers with different signs, the product will be negative.  Example: -2 x 3 = ______  -1 x 4 = ______  10 divided by -5 = ______

Your turn  Hint first determine sign:  x 2 = ___________  -12 divided by 6 = ______  36 divided by -6= ______  12 x 2= ______  -1 x -5= _____  -15 divided by -3 = _____

Complete each number sentence. Then write 2 example to illustrate each relationship.  Positive * positive = ___________  Ex: ______________  _________________

Look at worksheet 3.5  Problem # 1.  Positive divided by positive = ?  __________  Two examples: _____________ ________________________________________

Look at problem # 9  Circle the word ESTIMATE in the directions.  -72 x 57 ( Hint first round to the tens place, then times)  -72 becomes ____  57 becomes _____

Problem # 9  -70 x 60= ?

Problem # 11  Example of estimating when dividing; remember make them easy to do in your head!  -476 divided by 90  (first is the answer going to be – or +???)  Does 9 go into 476 even? If not what can we change 476 to so it does?

# 11  -476 divided by 90  9 x3= 27; 9x4=35;9x5=45; 9x6=54  So 9x what is the closest?

#11  -476 divided by 90  9 x 5 = 45  So change the -476 to -450 and divide by 90.  Answer:

Use order of operations  PEMDAS  Example: (4 x 6)divided by (-3)= ?  what do you do first?  24/-3 = ____

Lets do a few together  # / 9 + 4(-7)  # / (-4) + (-3)(-6)

A few more together  # (-5)(-4)  (9) – 4(-7)

What you learned today  When mult or dividing:  Same signs answer is positive  Different signs answer is negative  Be REALLY careful when doing order of operations!!! PEMDAS

Assignment:  Worksheet 3-5 all  Work with partner!