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A pizza had eight slices.
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Three of them had pepperoni on them.
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Which of these tells you how many slices did not have pepperoni, eight plus three, eight take away three, or five plus three?
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We know the whole pizza had eight slices.
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Three of them have pepperoni.
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If we take away those three pepperoni slices, that will tell us how many slices did not have pepperoni.
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So the number sentence which tells us how many slices did not have pepperoni is eight take away three.