Mental Math – 5

June 5, 2026

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Strategies

Lessons

Introduction Preview Addition: Breaking Up Numbers Round-and-Adjust" Strategy Subtraction: Breaking Up Numbers Subtraction: Rounding Numbers

Multiplication Basics

Lessons

Multiplying 2-Digit Numbers by 11 Multiplying 3-Digit Numbers by 11 Multiplication: Breaking Up Numbers (Part 1) Multiplication: Breaking Up Numbers (Part 2) Multiplication: Breaking Up Numbers (Part 3)

Multiplication Advanced

Lessons

Multiplication Magic The "Twin Tens" Multiplication Trick The "Twin Units" Multiplication Hack Multiplication: Identical First Digits for 2-Digit Numbers Multiplication: Identical First Digits, Sum of Last Digits Is 5 Multiplication: Multiplying 2-Digit Numbers by Hundreds

Division Basics

Lessons

Division Strategy: Breaking Up Numbers Finding Remainders When Dividing by 3 Division: Finding Remainders When Dividing by 4

Fractions Basics

Lessons

Adding Fractions with 1 as the Numerator Adding Fractions with the Same Numerator Subtracting Fractions with 1 as the Numerator

Decimals Basics

Lessons

Decimals: Multiplying by 10 ✖️ Multiplying Decimals by 100 Multiplying 2-Digit Numbers by Decimals Ending in 0.9 Decimals: Multiplying 2-Digit Numbers by 1.1 Decimals: Breaking Up Numbers to Multiply Decimals: Breaking Up Numbers Ending in 0 to Multiply Decimals: Dividing by 10 Decimals: Dividing by 100 Decimals: Breaking Up Numbers to Divide

Squaring Basics

Lessons

Squaring Numbers Ending with Zero Squaring Even Numbers Squaring Odd Numbers Squaring Numbers Ending in 1 Squaring Numbers Ending with 2 Squaring Numbers Ending with 3 Squaring Numbers Beginning with 5