CCSS.Math.Content.5.OA.A.2
The standard
Write simple expressions that record calculations with numbers, and interpret numerical expressions without evaluating them.
Common Core State Standards for Mathematics · Operations and Algebraic Thinking
What this standard means
Students need to turn words into numerical expressions, using parentheses when order matters. They also need to explain what an expression means without solving it. The focus is on structure, not computation.
Mastery looks like writing expressions such as 4 × (12 + 9) from a phrase and saying it means four groups of the sum of 12 and 9. Students often get stuck by doing the calculation too soon, leaving out parentheses, or reading 5 + 3 × 2 as “add 5 and 3, then multiply by 2.”
Ways to teach it
- Hands-on: Give students number cards, operation cards, and parentheses cards, then have them build expressions to match spoken calculation directions.
- Prompt: Explain in words what 6 × (14 + 8) means without finding the answer.
- Quick assessment: Show three expressions and three word phrases, then have students match them and circle the parentheses that matter.
- Real-world connection: Write an expression for buying 3 packs that each contain 12 pencils and 4 erasers, without calculating the total.
Plan a lesson for CCSS.Math.Content.5.OA.A.2
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Related standards
- CCSS.Math.Content.6.EE.A.2a
Write expressions that record operations with numbers and with letters standing for numbers.
- CCSS.Math.Content.5.OA.A
Write and interpret numerical expressions.
- CCSS.Math.Content.6.EE.A.1
Write and evaluate numerical expressions involving whole-number exponents.
- CCSS.Math.Content.6.EE.A.2
Write, read, and evaluate expressions in which letters stand for numbers.