Directed numbers - Year 7

Adding directed numbers

100

-15+(-10)=

-25

200

-25+30=

5

300

-3+(-2)+1=

-4

400

-2.8+(-5.3)=

-8.1

500

15+(-7.5)+0.5=

8

Subtracting directed numbers

100

7-(-4)=

11

200

1.7-(-4)=

5.7

300

-12-(-12)=

0

400

5.3-(-3.4)=

8.7

500

16-6-(-7.1)=

17.1

Multiplying and Dividing directed numbers

100

-7 x 10=

-70

200

-5 x -8 = ?

40 

300

? x (-8) = 24 

-3

400

-4.2 x -5=

21

500

-30 div-9

10/3  3 1/3

Mixed operations

100

-35-10+50=

5

200

Which has a greater value, a or b?

a= (15-4) x -7=

b= (-7 x -9) +14=

b

300

4 x (-13)+20=

-32

400

(-18 x ?) + 2= 20

-1

500

(4 x 3 + 10 x 2)/8 =

4

Word problems

100

Asel said -75+54 was 129.Is he wrong, and if so then say the real answer to the problem.

-21

200

Tina says -12 x -12 x -5 is -720, but Sarah says -12 x  -12 x -5 is 720. Who's right? Explain.

Tina

300

Mike wants to buy a Physics book costing $600. He has $475.25 only in his purse. How much more money does he need to purchase the book?

124.75

400

At night the temperature is -3 Celsius and then rises by 15 Celsius during the day. What is the temperature in the daytime?

12

500

There are 19.3 cups of flour in a bag. The chef uses 2.9 cups for making cookies. Then, he uses 1.2 cups of sugar and 5.1 cups of flour for making banana bread. How many cups of flour are left?

11.3 cups of flour left