WEBVTT
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Use plus or minus to make the following arithmetic operation correct: Five plus or minus five equals zero.
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We can draw a model to help us find the answer.
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First, let’s try using the plus symbol.
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Five plus five equals zero.
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Is this true?
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So does five plus five equal zero?
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Let’s check: one, two, three, four, five, six, seven, eight, nine, 10.
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Five plus five makes 10.
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So the missing symbol must be minus.
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Let’s check.
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So now we have five bricks.
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And we have to take away five.
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One take away two, three, four, five.
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Five take away five is zero.
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So the correct symbol is minus because five minus five equals zero.