Objectives By the end of the lesson students will: Understand requirements and structure of GCSE Maths course. Know what is available on Boodle and how to access it. Be able to perform calculations with negative numbers, e.g. −3−6 7−−2 9×−5

Negative and Positive Numbers

Adding and Subtracting Numbers

Adding and Subtracting Numbers -3 + 4 = 1 -4 - 3 = - 7 This is our start number This is the number of places we need to move This is the direction of move - +

Add Same Signs + 8 - - 6 = 14 Look at the signs in the middle, if they are the same, then replace them with +

- 8 + - 6 = 2 Subtract If Different Look at the signs in the middle, if they are different, then replace them with -

-6 + -2 = -6 - -8 = -8 2 What about this one? - + Can you use all your knowledge of negative numbers so far to find the answer to these calculations? - -6 + -2 = -6 - -8 = -8 2 + Remember: This is your start number and the new sign in the middle is the direction

Adding and Subtracting Numbers Add positive number   Subtract positive number  Add negative number Subtract negative number  8 – -5 is the same as 8 + 5 -7 + -2 is the same as -7 – 2 -10 – -12 is the same as -10 + 12 13 + -4 is the same as 13 – 4

Multiplying Numbers… Positive x Positive = Positive 6 x 7 = 42 Negative x Negative = Positive -6 x -7 = 42 Negative x Positive = Negative -6 x 7 = -42 Positive x Negative = Negative 6 x -7 = -42

Dividing Numbers… Positive ÷ Positive = Positive 42 ÷ 7 = 6 Negative ÷ Negative = Positive -42 ÷ -7 = 6 Negative ÷ Positive = Negative -42 ÷ 7 = -6 Positive ÷ Negative = Negative 42 ÷ -7 = -6