Operations with Integers and Rational Numbers

Adding Integers

100

-9 + (-3) =

-12

200

-11 + 7

-4

300

-42 + 79 =

37

400

-106 + 78 =

-28

500

-117 + (-99)

-216

Subtracting Integers

100

9 - (-5) =

14

200

-7 - 2 =

-9

300

-10 - (-8) =

-2

400

57 - (-23) =

80

500

-51 - 128 =

-179

Problems with Absolute Value

100

-5 * abs(-4)=

-20

200

abs(-2*2)+13=

17

300

abs(28+27) < abs(-8*7) =

55 < 56

400

Which expression has the greater value?

 abs(-56 div 7) +5 OR 

4* abs(-2-1)

abs(-56 div 7) +5

500

The temperature at noon in Miami Beach was 90°F. The temperature then changed 2°F per hour for the next 7 hours. The expression  90-abs(-2*7) represents the current temperature.

a. Is the current temperature higher or lower than 90°F?

b. What is the current temperature?

a. The temperature is lower than 90°F

b. The current temperature is 76°F

Multiplying Integers

100

6 x (-3) =

-18

200

-11 x (-6) =

66

300

-9 x 12 =

-108

400

-3 x (-4) x (-5) =

-60

500

-5 x 6 x (-7) =

210

Dividing Integers

100

81 ÷ (-9) =

-9

200

0 ÷ (-12) =

0

300

9 = (-63) ÷ _____

-7

400

-13 ÷ _____ = -1

13

500

_____ ÷ (-4) = 7

-28