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Starter Questions 1. Calculate 85% of 160 2. Calculate a) -2 + 6 b) -3 – 5 c) 6 + (-4) 3. Describe how you would express ⅝ as a percentage. 4. Bill and his 6 friends go out for a meal. The bill comes to £86.59 They decide to split the bill equally. How much should each person pay? Integers Learning Intentions To understand how to subtract negative numbers Integers We can use a number line to help us add positive and negative integers. –7 + 3 == -4 -7 -4 To add a positive integer we move forwards up the number line. Integers We can use a number line to help us add positive and negative integers. 2 - 5 == -3 -3 2 To subtract a positive integer we move backwards down the number line. Integers We can use a number line to help us add positive and negative integers. –3 + (–4) = –7 -7 -3 To add a negative integer we move backwards down the number line. –3 + –4 is the same as –3 – 4 Integers We can use a number line to help us subtract positive and negative integers. -4 – (-5) = 1 -4 1 To subtract a negative integer we move forward up the number line. –4 – (–5) is the same as –4 + 5 Integers We can use a number line to help us subtract positive and negative integers. –4 – (–7) = 3 -4 3 To subtract a negative integers we move forwards up the number line. –4 – (–7) is the same as –4 + 7 Integers Now try Ex 9.6 Pg 87 Ch 9 Integers Learning Intentions To understand how to subtract negative numbers