Mystery Bureau › Grade 5 standards › 5.OA.A.1
📘 Common Core · 5.OA.A.1 · Grade 5
This is a short standard that carries a lot of weight, because it is the first time students are asked to read an expression as a structure rather than a sequence. Left to right stops being a safe default. Expressions where a subtraction follows the parentheses — (6 + 3) × 7 − 6 — are where the misunderstanding surfaces, and they are worth over-practicing.
Quoted verbatim from the Common Core State Standards for Mathematics. Nothing here is paraphrased.
| 5.OA.A.1 | Use parentheses, brackets, or braces in numerical expressions, and evaluate expressions with these symbols. |
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In plain English: Use parentheses, brackets and braces in numerical expressions, and evaluate expressions that contain them.
Each one runs in the browser with no account and nothing stored. Five questions apiece.
Real output from the activities above — not written for this page, drawn from the same pools a student gets. The numbers are rebuilt on every attempt.
| (2 + 5) × 5 − 2 = ? | 33 |
| 7 × (8 + 4) = ? | 84 |
| 9 × (2 + 9) = ? | 99 |
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