multiplying and-dividing

18
What did Usher do wrong? Find absolute value 6 – (-9) 6 + (-9) -9 is the largest so – + plus – means subtract -3

Upload: ms-jones

Post on 18-May-2015

266 views

Category:

Technology


0 download

TRANSCRIPT

Page 1: Multiplying and-dividing

What did Usher do wrong?

Find absolute value

6 – (-9)

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

–+ plus – means

subtract-3

Page 2: Multiplying and-dividing

Human Number Line

Adding look right

Subtracting look left

Positive walk forward

Negative walk backward

Page 3: Multiplying and-dividing

5 + 2

Page 4: Multiplying and-dividing

-2 + 4

Page 5: Multiplying and-dividing

6-9

Page 6: Multiplying and-dividing

-3 – (-9)

Page 7: Multiplying and-dividing

5 + (-4)

Page 8: Multiplying and-dividing

Subtracting Integers…..What are we really

doing?

??!?!?

Page 9: Multiplying and-dividing
Page 10: Multiplying and-dividing

Organizing our Thoughts

Integer FoldablePart 2

Page 11: Multiplying and-dividing

SubtractingRules

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

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

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

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

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

1. - 3 – (-5)

2. 4 – 7

3. 6 – (-9)

4. -3 - 8

Page 12: Multiplying and-dividing

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!

Page 13: Multiplying and-dividing

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

Page 14: Multiplying and-dividing
Page 15: Multiplying and-dividing

Organizing our Thoughts

Integer FoldableParts 3 and 4

Page 16: Multiplying and-dividing

Multiplying

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

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

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

3. 4 (30)

4. (-9)•7

Page 17: Multiplying and-dividing

Dividing

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

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

1. -25 ÷ 5

2. -30 /-6

3. 24/12

4. 81 ÷ -9

Page 18: Multiplying and-dividing

Worktime Worksheet