Upcoming SlideShare
×

# Chapter1, Sec 9 Multiplying Dividing Integers

1,599 views

Published on

Chapter 1, Section 9: Multiplying and Dividing Integers.

2 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
• Be the first to comment

Views
Total views
1,599
On SlideShare
0
From Embeds
0
Number of Embeds
12
Actions
Shares
0
57
0
Likes
2
Embeds 0
No embeds

No notes for slide

### Chapter1, Sec 9 Multiplying Dividing Integers

1. 1. Chapter 1, Section 9 Multiplying and Dividing Integers Ms. Dewey-Hoffman, 2009
2. 2. Warm Up <ul><li>Adding and Subtracting Integers </li></ul><ul><li>4 + (-6) + 3 = </li></ul><ul><li>-72 + 36 + (-6) + (-18) = </li></ul><ul><li>-32 + 2 + (-10) = </li></ul><ul><li>-7 – (-7) + (-7) = </li></ul>
3. 3. Multiplying Integers <ul><li>To prove that the product of a negative number and a positive number is negative, write the problem as repeated addition . </li></ul><ul><li>4(-10) = (-10) + (-10) + (-10) + (-10) = -40 </li></ul><ul><li>Examples: </li></ul><ul><li>2(-6) = </li></ul><ul><li>4(-3) = </li></ul><ul><li>7(-2) = </li></ul><ul><li>21(-1) = </li></ul>
4. 4. Multiplying Integers <ul><li>The answer (product) of two integers with the same sign is Positive. </li></ul><ul><li>The answer (product) of two integers with different signs is Negative. </li></ul><ul><li>The answer (product) of zero and any integer is zero. </li></ul><ul><li>-3(-4) • -4 = </li></ul><ul><li>-4 • 8(-2) = </li></ul><ul><li>6(-3)(5) = </li></ul><ul><li>-7 • (-14) • 0 = </li></ul>An even number of negative numbers = a positive answer. An odd number of negative numbers = a negative answer.
5. 5. Dividing Integers <ul><li>Use the same rules of multiplying as dividing. </li></ul><ul><li>The quotient of two integers with the same sign is positive. </li></ul><ul><li>The quotient of two integers with different signs is negative. </li></ul><ul><li>Remember that division by zero is undefined . </li></ul><ul><li>-32 ÷ 8 = </li></ul><ul><li>-48 ÷ (-6) = </li></ul><ul><li>-56 ÷ (-4) = </li></ul><ul><li>-140 ÷ 5 = </li></ul>
6. 6. #5 <ul><li>Do the worksheets. </li></ul><ul><li>Even Numbered Problems. </li></ul><ul><li>Do the work on a SEPARATE sheet of paper, follow the homework guidelines. </li></ul>