Multiplying and-dividing

What did Usher do wrong?

Find absolute value

6 – (-9)

6 + (-9)-9 is the largest so

–+ plus – means

subtract-3

Human Number Line

Adding look right

Subtracting look left

Positive walk forward

Negative walk backward

5 + 2

-2 + 4

6-9

-3 – (-9)

5 + (-4)

Subtracting Integers…..What are we really

doing?

??!?!?

Organizing our Thoughts

Integer FoldablePart 2

SubtractingRules

1.Change problem to addition by “adding the opposite”

(+) - (+) = (+) + (-)

(-) - (-) = (-) + (+)

(+) - (-) = (+) + (+)

(-) - (+) = (-) + (-)

1. - 3 – (-5)

2. 4 – 7

3. 6 – (-9)

4. -3 - 8

First ½ Sing to the tune of

"Row Row Row Your Boat"

Same sign add and keepDifferent sign subtract

Take the sign of the farther numberThen it'll be exact!

Is it an addition problem?

Yes

Look at the farthest number

No

Add the opposite

Is the positive or negative number

larger?

Look at the fartheset number

+ is largerFinal answer is

positive

- is larger

Final answer is negative

- Is the largest

+ Is the largest

Organizing our Thoughts

Integer FoldableParts 3 and 4

Multiplying

Rules1. + times - = -2. - times + = -

3.+ times + = + 4.- times - = +

1. -9(-10)2. 4 x -45

3. 4 (30)

4. (-9)•7

Dividing

Rules1. + times - = -2. - times + = -

3.+ times + = + 4.- times - = +

1. -25 ÷ 5

2. -30 /-6

3. 24/12

4. 81 ÷ -9

Worktime Worksheet