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Grade 4 · unit review

Review: Compare Multiplicatively and Investigate Factors

Distinguish times-as-many from more, find factors, classify primes, and explain patterns.

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Bring the unit skills together

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Unit review questions
1. A reference box holds 9 cards. Another holds four times as many. How many does the other hold?
Need a hint?
  • Underline times as many or more before calculating.
  • A multiplier does not mean an added difference.
2. The target is 54, and 9 is a factor. What is its factor partner?
Need a hint?
  • Multiply the proposed pair to check the target.
  • A divisor leaving a remainder is not a whole-number factor.
3. Classify the whole number 1.
Need a hint?
  • A single nontrivial factor pair proves a number is composite.
  • One is neither prime nor composite.
4. Start at 6 and apply add 4 three times. What is the resulting term?
Need a hint?
  • Check every neighboring difference against the rule.
  • Do not invent a new rule after seeing only a few terms.

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Use the skills in a new task

List the factor pairs of 24 and decide whether it is prime. Then compare four times six with six plus four.

Work on paper or in your own document. Explain the choices you made.

  • Draw or label the numbers or shape features the task gives you.
  • Say why each calculation or shape choice follows the ideas in this unit.
  • Check that your answer fits the story or drawing in the task.
Compare with a model response

Factor pairs are 1×24,2×12,3×8,4×6. Twenty-four is composite. Four times six is 24, while six plus four is 10; times-as-many and more are different comparisons.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.