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Problem a.

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Let's find the factors of twelve.

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One row of twelve. One times twelve is twelve.

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Two rows of six. Two times six is twelve.

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Three rows of four. Three times four is twelve.

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The factors of twelve are one two three four six and twelve.

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Twelve is a composite number.

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Problem b.

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Let's find the factors of eight.

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One row of eight. One times eight is eight.

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Two rows of four. Two times four is eight.

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The factors of eight are one two four and eight.

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Eight is a composite number.

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Problem c.

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Let's find the factors of fifteen.

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One row of fifteen. One times fifteen is fifteen.

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Three rows of five. Three times five is fifteen.

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The factors of fifteen are one three five and fifteen.

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Fifteen is a composite number.

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Problem d.

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Let's find the factors of seven.

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One row of seven. One times seven is seven.

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Seven only has one factor pair.

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The factors of seven are one and seven.

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Seven is a prime number.

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Problem e.

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Let's find the factors of eighteen.

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One row of eighteen. One times eighteen is eighteen.

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Two rows of nine. Two times nine is eighteen.

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Three rows of six. Three times six is eighteen.

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The factors of eighteen are one two three six nine and eighteen.

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Eighteen is a composite number.

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Problem f.

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Let's find the factors of eleven.

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One row of eleven. One times eleven is eleven.

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Eleven only has one factor pair.

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The factors of eleven are one and eleven.

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Eleven is a prime number.