Topic 9

North Carolina Standard Course of Study Third Grade Mathematics

NC.3.NBT.A Use place value to add and subtract.

NC.3.NBT.2 Add and subtract whole numbers up to and including 1,000.

• Use estimation strategies to assess reasonableness of answers.
• Model and explain how the relationship between addition and subtraction can be applied to solve addition and subtraction problems.
• Use expanded form to decompose numbers and then find sums and differences.

NC.3.OA.D Solve two-step problems.

NC.3.OA.8 Solve two-step word problems using addition, subtraction, and multiplication, representing problems using equations with a symbol for the unknown number.

Please try "Thinking Blocks Junior" (Bar Diagrams)

Addison and Subtraction

Students can view and practice how to use bar diagrams to solve word problems from the links below. Please scroll down to find the video(s) you need.