Florida B.E.S.T. MA.3.AR.2.1

Math3rd GradeDevelop an understanding of equality and multiplication and division.

The Standard

Restate a division problem as a missing factor problem using the relationship between multiplication and division.

Florida B.E.S.T. Standards for Mathematics

Teacher's field guide

What Students Need to Do: Students rewrite a division equation as a multiplication equation with a missing factor. They use the known product and factor to find the quotient.
What Mastery Looks Like: Students can rewrite 24 ÷ 6 = ? as 6 × ? = 24. They find the missing factor and explain that it is also the quotient.
Common Misconceptions: Students may multiply the dividend and divisor instead of finding the missing factor. They may reverse the numbers and write 24 × ? = 6 for 24 ÷ 6.
How to Assess It: Give the prompt: “Rewrite 35 ÷ 5 = ? as a multiplication equation, then solve.” Look for 5 × ? = 35 and an answer of 7.

Lesson moves

Give students 24 counters to arrange into groups of 6, then have them write 6 × ? = 24.
Ask, “How does 7 × 4 = 28 help you solve 28 ÷ 7?” and have students explain in writing.
Play a matching game with division equation cards, missing factor equation cards, and quotient cards.
Present a story about packing 30 oranges into bags of 5, then connect the number of bags to 5 × ? = 30.

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