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Use mathematical reasoning and beginning understanding of tens and ones, including the use of invented strategies, to solve two-digit addition and subtraction problems.
Remarks
Invented and standard algorithms should be explored to help students reason about joining, separating and comparing numbers, and about the relationship between tens and ones.Example: Adding 27 and 15, a student might reason that 27 is 20 + 7 and that 15 is 10 + 5. In determining the result, they combine 20 + 10=30 and 7 + 5 =12. The final answer involves the simpler addition problem of 30 + 12 is 42.
Activities should include contexts such as money.
General Information
Subject Area: X-Mathematics (former standards - 2008)
Grade: 1
Body of Knowledge: Algebra
Idea: Level 3: Strategic Thinking & Complex Reasoning
Supporting Idea: Number and Operations - Number and Operations
Date Adopted or Revised: 09/07
Content Complexity Rating:
Level 3: Strategic Thinking & Complex Reasoning
-
More Information
Date of Last Rating: 06/07
Status: State Board Approved - Archived
Related Access Points
Alternate version of this benchmark for students with significant cognitive disabilities.
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