Florida B.E.S.T. MA.3.AR.2.3

Math3rd GradeDevelop an understanding of equality and multiplication and division.

The Standard

Determine the unknown whole number in a multiplication or division equation, relating three whole numbers, with the unknown in any position.

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

Teacher's field guide

What Students Need to Do: Students find a missing number in multiplication and division equations, no matter where the unknown appears. They use equal groups, arrays, or related multiplication and division facts to solve and check.
What Mastery Looks Like: Students solve equations with the unknown as a factor, product, dividend, divisor, or quotient. They explain their reasoning with equal groups, an array, or a related fact, then check by substitution.
Common Misconceptions: Students may assume the unknown always comes after the equals sign. They may mix up the divisor and dividend, or use multiplication's turn-around rule with division.
How to Assess It: Give an exit ticket with ? × 8 = 56, 45 ÷ ? = 5, and ? ÷ 6 = 7. Ask students to solve and check each answer.

Lesson moves

Build equal groups with 24 counters, then solve cards such as ? × 6 = 24 and 24 ÷ ? = 4.
Ask, “How can the same fact family help solve 7 × ? = 42 and 42 ÷ ? = 7?”
Play Missing Number Match by pairing equation cards with unknowns in different positions to their correct number cards.
Give a packing problem: 36 muffins fill ? boxes with 6 muffins per box, then write and solve the equation.

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$Preview of the MA.3.AR.2.3 printable worksheet$

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