Unit 2 Integers - msburtmmc.weebly.commsburtmmc.weebly.com/uploads/1/3/2/1/13217705/2.1_notes.pdf · Unit 2 Integers. Section 2.1.notebook October 20, 2016 Review... Adding Integers

Section 2.1.notebook October 20, 2016

Unit 2 Integers


Review...

Adding Integers

1. If the signs are the same, you add the numbers and keep the sign the same.

Ex: (6) + (5) = (+5) + (+4) =

2. If the signs are different, you subtract the numbers and keep the sign of the biggest number.

Ex: (8) + (+3) = (8) + (+10) =


Examples:


Subtracting Integers

To subtract integers, you add the opposite.

1. Keep the first integer the same2. Change subtraction to addition3. Change the sign of the second integer4. Use addition rules (same sign add, different signs subtract)

Ex: (8) (5) = (+7) (4) =


Examples:


Worksheet on Adding and Subtracting

Integers


Section 2.1 Using Models to Multiply Integers


What is a zero pair?


Method 1: Integer Tiles

When you use the tile method, the jar should start with a value of zero.First integer Tells you how many sets to put in or take out (+) put sets in () take sets out

Second integer Tells you how many of each tile you need (+) use yellow or unshaded () use red or shaded

NOTE: If you have to take out counters you may need to add ZERO PAIRS!


Example:

(+3) x (4)


(2) x (+5) =


(+3) x (2) =

(3) x (+2) =


Worksheet Multiplying Integers Using Tiles



Method 2: Using Number Lines

Always start on ZERO!!!First Integer: Tells you how many steps to take (+) face positive end () face negative end

Second Integer: Tells you what size step to take (+) walk forward () walk backward


Example:

1) (+3) x (4)


Example:

(2) x (5) =


Example:

10 2 3 4 5 6 7 8 9 1012345678910


Page 6870

#'s 5Integer tile method:

6,9,10,11

Number line method:7, 8, 12, 20


Documents

Unit 2 Integers - msburtmmc.weebly.commsburtmmc.weebly.com/uploads/1/3/2/1/13217705/2.1_notes.pdf · Unit 2 Integers. Section 2.1.notebook October 20, 2016 Review... Adding Integers