Place Value and Multi-Digit Arithmetic · Number Sense

Flexible Addition and Subtraction

Developing fluency with addition and subtraction within 1000 using various strategies and algorithms.

Key Questions

  1. 1How does decomposing a number by place value make mental math easier?
  2. 2Why does the value of a digit change when we regroup or borrow?
  3. 3How can we use the relationship between addition and subtraction to verify our work?

Common Core State Standards

CCSS.Math.Content.3.NBT.A.2
Grade: 3rd Grade
Subject: Mathematics
Unit: Place Value and Multi-Digit Arithmetic
Period: Number Sense

Suggested Methodologies

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