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Scarlett knows the answer to nine multiplied by three.
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Nine multiplied by three equals 27.
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Tell her what to subtract from this to find the answer to seven multiplied by three.
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What is seven multiplied by three?
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Nine multiplied by three is the same as saying nine groups of three.
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We’re already told in the problem the number fact that nine multiplied by three equals 27.
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Seven groups of three is two groups of three less than nine groups of three.
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So we can cross out two groups of three to show this.
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This is six less.
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So Scarlett needs to subtract six from 27 to find the answer.
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27 subtract six equals 21.
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So we also know that seven multiplied by three equals 21.