CCSS.Math.Content.3.OA.B.6
The standard
Understand division as an unknown-factor problem.
Common Core State Standards for Mathematics · Operations and Algebraic Thinking
What this standard means
Students need to see division as a missing multiplication fact. Instead of only thinking “share these equally,” they should ask, “What number times this divisor makes the total?” They should connect fact families, arrays, and equal groups.
Mastery looks like solving facts such as 32 ÷ 8 by saying 8 × 4 = 32, so the answer is 4. Students often get stuck when they memorize steps without linking the numbers, or when they mix up the divisor and quotient in word problems.
Ways to teach it
- Hands-on: Build arrays with counters for 24, then cover one side label and ask students to name the missing factor.
- Prompt: Explain how 6 × ___ = 42 helps you solve 42 ÷ 6, using words and a picture.
- Quick check: Give five division facts and have students write the matching missing-factor equation for each one.
- Real-world: Use 36 stickers and ask, “If 9 go on each page, how many pages can we fill?”
Plan a lesson for CCSS.Math.Content.3.OA.B.6
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Related standards
- CCSS.Math.Content.1.OA.B.4
Understand subtraction as an unknown-addend problem.
- CCSS.Math.Content.5.NF.B.7b
Interpret division of a whole number by a unit fraction, and compute such quotients.
- CCSS.Math.Content.3.OA.A.4
Determine the unknown whole number in a multiplication or division equation relating three whole numbers.
- CCSS.Math.Content.5.NF.B.7a
Interpret division of a unit fraction by a non-zero whole number, and compute such quotients.