Adding and Subtracting Integers

Oct 26 Adding and Subtracting Integers

The rules for the next 5 years

Poll

What is an integer rule for adding

$$-4+\left(-5\right)?$$  

• Same sign add and keep

• Different sign subtract and keep the higher number

• Keep Change Change

Poll

What is an integer rule for adding

$$4+\left(-5\right)?$$  

• Same sign add and keep

• Different sign subtract; and keep the sign of the higher number

• Keep Change Change

Adding Integer Rules (tune: row, row, row your boat)

• Same sign, add and keep

• Different signs subtract, keep the sign of the bigger number

• Then you will be exact

Another way

• same sign, find the sum and keep the sign

• different sign, find the difference and keep the bigger

You have two minutes to get pencil and paper

you will need it today

Open Ended

Which way do you want to remember how to add integers? Row, row, row your boat or same sign, find the sum; different sign, find the difference? choose, you will use this all day. [write it down]

Multiple Choice

-9 + (-5)

• -14

• 14

• -4

Multiple Choice

-8 + 20

• -28

• 28

• 14

• 12

Subtracting Integers with Keep Change Change

• Keep the first integer

• Change the subtraction to addition

• Change the second integer to the opposite

Multiple Choice

(-9) - (+3)

• -12
• -6
• 6
• 12

Multiple Choice

-4 - 6 =

• -10

• 10

• 2

• -2

Multiple Choice

3 - 11 =

• -8

• 8

• 14

• -14

On to Desmos

Link in the chat