The Power of Ten: Building Place Value and Fluency · Number & Operations

Mental Math and Strategic Fluency

Developing flexible strategies for adding and subtracting within 20 and 100 using properties of operations.

Key Questions

  1. 1How can breaking a number apart make it easier to add or subtract mentally?
  2. 2When is it more helpful to 'count on' versus using a known fact like a double?
  3. 3Why do different strategies lead to the same result if the logic is sound?

Common Core State Standards

CCSS.Math.Content.2.OA.B.2CCSS.Math.Content.2.NBT.B.8
Grade: 2nd Grade
Subject: Mathematics
Unit: The Power of Ten: Building Place Value and Fluency
Period: Number & Operations

Suggested Methodologies

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