Directed Numbers Hole in the sand Sandcastle 1

Directed Numbers

Hole in the sand Sandcastle +1 or 1 -1 -1 + 1 = 0 -1 + (+1) = 0 1 + -1 = 0 +1 + (-1) = 0 0

Directed Numbers Exercise 1 1. 4 x -2 = -8 7. -6 x 8 = -48 2. -3 x 4 = -12 8. 9 x -6 = -54 3. 5 x -4 = -20 9. 5 x -2 = -10 4. 3 x 10 = 30 10. -5 x -2 = 10 5. 4 x -6 = -24 11. 8 x -5 = -40 6. 7 x 8= 12. -8 x -5 = 40 56

3 + 3+-3=0 -3

Directed Numbers Exercise 2 1. 8 + -2 = 6 7. 4 + -8 = -4 2. -2 + 2 = 0 8. -1 + -5 = -6 3. 6 + -4 = 2 9. 9 + -1 = 4. 6 + -10 = -4 10. 40 + -2 = 38 5. 0 + - 6 = -6 11. 28 + -40 = -12 6. 10 + -2 = 8 12. -18 + -15 = -33 8

5 -2 5 -2=3

-7 + 4 = -3 Subtracting -4 is the same as adding 4.

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

Directed Numbers Exercise 3 1. 8 -2= 6 7. -20 – (-8) = - 12 2. -8 - 2 = -10 8. 5 -1= 3. 6 – (-4) = 10 9. 5 – (-1) = 6 4. -5 – (-2) = -3 10. 30 - -2 = 32 5. -10 - 6 = - 16 11. - 26 - 14 = - 40 6. 10 - -2 = 12 12. - 26 – (-14) = - 12 4