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Published byElisabeth Marianna Watts Modified over 6 years ago

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Multiplying Positive & Negative Numbers. -6 x –4 = =

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Multiplying A Positive Times A Negative. Consider the sum below : 5 × -3 = This sum means 5 lots of -3 -3 = =-15 In other words : 5 × -3 = -15 Rule 1: A plus times a minus or a minus times a plus makes a minus. Examples : Try These. (1) 2 × - 4 = (2) - 5 × 6 = (3) - 7 × 3 = - 8 - 30 - 21

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Multiplying A Negative Times A Negative. Complete the number pattern below: - 4 × 5 = - 4 × 4 = - 4 × 3 = - 4 × 2 = - 4 × 1 = - 4 × 0 = - 4 × -1 = - 4 × -2 = - 20 - 16 - 12 - 8 - 4 0 4 8 Look at the pattern Rule 2 : A negative times a negative or a positive times a positive makes a positive. Examples: Try These (1) – 2 × - 5 = (2) – 3 × - 6 = (3) 4 × 8 = (4) – 6 × - 7 = 10 18 32 42

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What Goes In The Box ? Try these examples yourself: (1) – 2 × 8 = (2) – 4 × - 7 = (3) 5 × - 6 = (4) – 4 × - 3 = (5) – 7 × 10 = (6) 1 2 × - 2 = (7) 5 × - 7 = (8) – 7 × - 8 = (9) – 20 × 10 = (10) 2 2 × -3 = (11) – 20 × -10 = (12) 12 × 9 = -16 28 -30 12 -70 -24 -35 56 -200 -66 200 108

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