7th Grade: Operations with Rational Numbers

Only Integers

100

-3 + (-2)

-5

200

4 - (-18)

22

300

72 - 80

-8

400

-85 / -5

17

500

(13)(-120)

-1560

Adding/Subtracting

100

1.2 - (-3)

4.2

200

-1/2 + 3/2

1

300

-4/13 - 8/13

-12/13

400

-8.9 - 11.3

-20.2

500

-5/6 + (-3/4)

-1 7/12

Multiplying

100

(8)(-7)

-56

200

(2/3)(-3/4)

-1/2

300

(-3.2)(-5)

16

400

(-5)(1/3)

-1 2/3

500

(-2.57)(3)

-7.71

Dividing

100

12 / -6

-2

200

(-1/4) / (3/8)

-2/3

300

-20.5 / -5

4.1

400

(7/9) / (-7/3)

-1/3

500

- (286 / 11)

-26

Rules

100

Negative x Negative =

Positive

200

Positive / Negative = 

Negative

300

Negative + Negative

Negative

400

When there are two negative symbols back-to-back, you should...

Change them to a PLUS sign (add)

500

When doing addition/subtraction:

What do you do when you have numbers with different signs?

Subtract and keep the sign of the greater number