The Power of Ten and Place Value · Number and Operations in Base Ten

Mental Strategies for Addition

Adding within 100 using concrete models and strategies based on place value properties.

Key Questions

  1. 1How can we decompose a number to make it easier to add to another?
  2. 2Why does adding tens to tens and ones to ones work as a strategy?
  3. 3When is it helpful to compose a new ten during addition?

Common Core State Standards

CCSS.Math.Content.1.NBT.C.4CCSS.Math.Content.1.NBT.C.5
Grade: 1st Grade
Subject: Mathematics
Unit: The Power of Ten and Place Value
Period: Number and Operations in Base Ten

Suggested Methodologies

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