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Published byBenedict Gibson Modified over 8 years ago

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Presents

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What are integers? 01234567-2-3-4-5-6-7 positive numbersnegative numbers Integers is the family name for positive and negative whole numbers. Integers

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Adding and Subtracting Integers °C 10 9 8 7 6 5 0 3 1 2 4 -2 -3 -5 -4 -3 + 5 = -3 +5 2 2

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Adding and Subtracting Integers °C 10 9 8 7 6 5 0 3 1 2 4 -2 -3 -5 -4 -3 + 5 = -5 +4 2 -5 + 4 =

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Adding and Subtracting Integers °C 10 9 8 7 6 5 0 3 1 2 4 -2 -3 -5 -4 -3 + 5 = -3 -8 5 2 -5 + 4 = 5 - 8 =-3

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Adding and Subtracting Integers °C 10 9 8 7 6 5 0 3 1 2 4 -2 -3 -5 -4 -3 + 5 = -5 -4 2 -5 + 4 = 5 - 8 =-3 -1 - 4 =-5

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Adding and Subtracting Integers °C 10 9 8 7 6 5 0 3 1 2 4 -2 -3 -5 -4 -3 + 5 = 2 -6 8 2 -5 + 4 = 5 - 8 =-3 -1 - 4 =-5 8 + (- 6) =2

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Now try Exercise 2A

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Subtracting negative numbers 5 – 3 =2 5 – 2 =3 5 – 1 =4 5 – 0 =5 5 – (-1) = 5 – (-2) = 7 5 – (-3) = 8 Look at the numbers in green. What comes next? ? 6 Can you think of an easy way of remembering this?

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Subtracting negative numbers 4 (-5) =

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Subtracting negative numbers 4 4 + 5 = (-5) = 9

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Subtracting negative numbers 3 (-2) =

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Subtracting negative numbers 3 3 + 2 = (-2) = 5

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Subtracting negative numbers (-7) =

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Subtracting negative numbers -1 + 7 = (-7) = 6

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Now try Exercise 2B

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Multiplying negative numbers 3 x 5 =15 3 x (-5) =-15 5 + 5 + 5 =15 (-5) + (-5) + (-5) =-15

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Multiplying negative numbers positive x negative = negative

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K Hughes 2002

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