Directed Numbers

SandcastleHole in the sand +1 or = = (+1) = (-1) = 0

3 x -1 = -3 3 x (-1) = x 3 = -3 (-1) x 3 = -3

-2 3 x -2 = -6 3 x (-2) = x 3 = -6 (-2) x 3 = -6 -2

Exercise 1 Directed Numbers 1.4 x -2 = 2.-3 x 4 = 3.5 x -4 = 4.3 x 10 = 5.4 x -6 = 6.7 x 8 = 7.-6 x 8 = 8.9 x -6 = 9.5 x -2 = x -2 = 11.8 x -5 = x -5 =

= - 6

= 0

= 2

= -1

Exercise 2 Directed Numbers = = = = = = = = = = = =

= 3

-7 - (- 4) -7 - (- 4) = -3

= -3 Subtracting -4 is the same as adding 4.

-10 – (-3) = = -7

6 – (- 4) =10 It may be easier just to think: 6 – (-4) = = 10

8 – (- 5) = – (-2)= – 10= - 2

Exercise 3 Directed Numbers = = 3.6 – (-4) = 4.-5 – (-2) = = = – (-8) = = 9.5 – (-1) = = = – (-14) =