This task is about calculations with negative numbers.
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Denis has a pack of cards in which each card is either black or red. Each card has a number on it.
The red cards show positive numbers and the black cards show negative numbers.
For example, a red 4 represents 4, but a black 6 represents ⁻6.
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a) Denis draws out two cards and multiplies the numbers together.
Find the answers he gets for each of these combinations of cards.
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| 1st card | × 2nd card |
= Answer
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i)
ii)
iii)
iv)
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Red 3
Black 4
Black 8
Red 6
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× Red 9
× Red 6
× Black 5
× Black 5
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= __________
= __________
= __________
= __________
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b) Next Denis draws out three cards. He multiplies the first two and then adds the third. Find the answers he gets for each of these combinations of cards. |
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1st card |
× 2nd card |
+ 3rd card |
= Answer |
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i)
ii)
iii)
iv)
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Red 5
Black 6
Black 8
Black 3
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× Red 3
× Red 4
× Red 4
× Black 2
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+ Black 4
+ Red 10
+ Black 5
+ Black 7
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= __________
= __________
= __________
= __________
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