# Interactive Problem Solving - Thinking Blocks

Thinking Blocks Interactive Tutorials - Model and solve word problems with addition and subtraction. Online interactive tutorial (First-Fourth).

**Online Word Problems with Double-Digit Addition and Subtraction**

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**Online Word Problems with Triple-Digit Addition and Subtraction**

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**Online Word Problems with Double-Digit Addition and Subtraction Two Steps**

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**Online Word Problems with Double-Digit Addition and Subtraction Extra Information**

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**Online Word Problems with Addition and Subtraction Challenge Problems**

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**Represent and solve problems involving addition and subtraction.**

Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

**Solve problems involving the four operations, and identify and explain patterns in arithmetic.**

Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.

**Use the four operations with whole numbers to solve problems.**

Solve multistep word problems posed with whole numbers and having whole-number answers using the four operations, including problems in which remainders must be interpreted. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.