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Which number is correctly classified? Choose the TRUE statement.

Class 6Playing with NumbersPlaying with Numbers
  • A1 is a prime number.
  • B7 is a composite number.
  • C12 is a composite number.
  • D0 is a prime number.

Step-by-Step Solution

12 = has more than two factors, so it is composite. 1 and 0 are neither prime nor composite, and 7 is prime (not composite).
Answer: C) 12 is a composite number.

Key idea: Factors come in pairs

To find every factor of a number, walk up from 1 and check each whole number — if it divides the number with no remainder, it is a factor. Factors come in **pairs**: if 4 is a factor of 12, so is 12 ÷ 4 = 3. So you only need to check up to the square root of the number to find them all. Factors of 12: — six factors total: 1, 2, 3, 4, 6, 12. Every number has 1 and itself as factors.

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