Topics in basic math and elementary school mathematics which include fractions, decimals, percents, integers, ratio and proportion.

**Greatest Common Divisor/Greatest Common Factor**

Lesson 1: Understanding Common Divisors

Lesson 2: Common Divisors and Greatest Common Divisor

Lesson 3: Exercises on Getting the GCD

Lesson 4: Getting the GCD by Prime Factorization

Lesson 5: GCD and Reducing Fractions to Lowest Terms

**Least Common Multiple**

Lesson 1: Least Common Multiple Part 1

Lesson 2: Least Common Multiple Part 2

Lesson 3: Least Common Multiple Part 3

Rounding Numbers

Lesson 1: Introduction to Rounding Numbers

Lesson 2: How to Round Numbers to the Nearest Ten

Lesson 3: Rounding Numbers to the Nearest Hundred

Lesson 4: Rounding Numbers to the Nearest Thousand

Lesson 5: Rounding Numbers to the Nearest Tenth

Lesson 6: Rounding Numbers to the Nearest Hundredth

Lesson 7: Rounding Numbers to the Nearest Thousandth

**Addition of Fractions Tutorial Series**

Lesson 1: Addition of Similar Fractions

Lesson 2: Addition of Dissimilar Fractions (LCM by Listing)

Lesson 3: Addition of Dissimilar Fractions (LCM by Ladder Method)

Lesson 4: Addition of Mixed Fractions

**Subtraction of Fractions Tutorial Series**

Lesson 1: Subtraction of Similar Fractions

Lesson 2: Subtraction of Fractions (Dissimilar Fractions)

Lesson 3: Subtraction of Fractions (Mixed Fractions)

Lesson 4: Subtraction of Mixed Fractions Part 1 (Shortcut)

Lesson 5: Subtraction of Mixed Fractions Part 2 (Shortcut)

**Multiplication of Fractions Tutorial Series**

Lesson 1: Multiplication of Fractions (Proper and Improper)

Lesson 2: Multiplication of Fractions (Mixed Fractions)

Lesson 3: Multiplication of Fractions (Shortcut: Cancellation Method)

**Division of Fractions Tutorial Series**

Lesson 1: Division of Fractions (Proper and Improper)

Lesson 2: Division of Fractions (Mixed Fractions)

**Comparing and Ordering Fractions**

Part 1: How to Compare Fractions Part 1 (by Cross Multiplication)

Part 2: How to Compare Fractions Part 2 (by Converting to Similar Fractions)

Part 3: How to Compare Fractions Part 3 (by Geometric Approximation)

**Fractions Tutorial Series**

Lesson 1: Introduction to Fractions

Lesson 2: Representing Fractions

Lesson 3: Representing Fractions (Examples)

Lesson 4: Comparing Similar Fractions

Lesson 5: Comparing Fractions (Examples)

Lesson 6: Addition of Similar Fractions

Lesson 7: Addition of Similar Fractions (Examples)

Lesson 8: Subtraction of Similar Fractions

Lesson 9: Subtraction of Similar Fractions (Examples)

Lesson 10: Fractions Larger than 1

Lesson 11: Addition of Mixed Fractions (Similar Fractions)

Lesson 12: Subtraction of Mixed Fractions (Similar Fractions)

Lesson 13: Equivalent Fractions

Lesson 14: Comparing Dissimilar Fractions

Lesson 15: Reducing Fractions to Lowest Terms

Lesson 16: Converting Improper Fractions to Mixed Fractions

Lesson 17: Converting Mixed Fractions to Improper Fractions

Lesson 18: Addition of Dissimilar Fractions Part 1

Lesson 19: Addition of Dissimilar Fractions Part 2

Lesson 20: Addition of Mixed Fractions (Dissimilar Fractions)

Lesson 21: Subtraction of Mixed Fractions (Dissimilar Fractions)

Lesson 22: Multiplication of Fractions

Lesson 23: Reciprocal of a Number

Lesson 24: Division of Fractions

**Decimals**

Lesson 1: How to Add Numbers with Decimals Part 1

Lesson 2: How to Add Numbers with Decimals Part 2

Lesson 3: How to Subtract Numbers with Decimals Part 1

Lesson 4: How to Subtract Numbers with Decimals Part 2

Lesson 5: How to Multiply Numbers with Decimals Part 1

Lesson 6: How to Multiply Numbers with Decimals Part 2

Lesson 7: How to Divide Numbers with Decimals Part 1

Lesson 8: How to Divide Numbers with Decimals Part 2

Lesson 9: How to Divide Numbers with Decimals Part 3

Lesson 10: How to Divide Numbers with Decimals Part 4

Lesson 11: How to Divide Numbers with Decimals Part 5

**Decimals **

Lesson 1: How to Add Numbers with Decimals

Lesson 2: How to Subtract Numbers with Decimals

Lesson 3: How to Multiply Numbers with Decimals

Lesson 4: How to Divide Numbers wtih Decimals

**Percent**

Lesson 1: Introduction to the Concept of Percent

Lesson 2: Representation with Percent, Decimal, Fraction Part 1

Lesson 3: Representation with Percent, Decimal, Fraction Part 2

Lesson 4: Converting Percent to Decimal and Fraction

Lesson 5: Converting Fraction to Percent

Lesson 6: Converting Decimal, Percent, and Fractions

**Fraction Decimal Percent Conversion**

Lesson 1: How to Convert Decimal Numbers to Fractions Part 1

Lesson 2: How to Convert Decimal Numbers to Fractions Part 2

Lesson 3: How to Convert Fractions to Decimal Numbers Part 1

Lesson 4: How to Convert Fractions to Decimal Numbers Part 2

Lesson 5: How to Convert Fractions to Percent Part 1

Lesson 6: How to Convert Fractions to Percent Part 2

Lesson 7: How to Convert Percent to Fraction Part 1

Lesson 8: How to Convert Percent to Fraction Part 2

Lesson 9: How to Convert Percent to Decimal Numbers

Lesson 10: How to Convert Decimal Numbers to Percent

**Repeating Decimals**

Lesson 1: How to Convert Repeating Decimals to Fractions Part 1

Lesson 2: How to Convert Repeating Decimals to Fractions Part 2

Lesson 3: How to Convert Repeating Decimals to Fractions Part 3

**How to Add Integers**

How to Add Integers Part 1

How to Add Integers Part 2

How to Add Integers Part 3

**How to Subtract Integers**

How to Subtract Integers Part 1

How to Subtract Integers Part 2

How to Subtract Integers Part 3

**How to Multiply Integers**

How to Multiply Integers Part 1

How to Multiply Integers Part 2

How to Multiply Integers Part 3

**How to Divide Integers**

How to Divide Integers Part 1

How to Divide Integers Part 2

How to Divide Integers Part 3

**PEMDAS and Order of Operations**

Lesson 1: PEMDAS Order of Operations Part 1

Lesson 2: PEMDAS Order of Operations Part 2

Lesson 3: PEMDAS Order of Operations Part 3

PEMDAS Tutorial Series (**New!**)

- PEMDAS Tutorial 1 – Multiplication with Division, Addition with Subtraction
- PEMDAS Tutorial 2 – Multiplication, Division, Addition, and Subtraction
- PEMDAS Tutorial 3 – Working with Parenthesis
- PEMDAS Tutorial 4 – MDAS with Grouping Symbols
- PEMDAS Tutorial 5 – Parenthesis, Exponents, and MDAS Part 1
- PEMDAS Tutorial 6 – Parenthesis, Exponents, and MDAS Part 2
- PEMDAS Tutorial 7 – More PEMDAS Exercises
- PEMDAS Tutorial 8 – PEMDAS with Nested Parentheses

**Integers**

Lesson 1: Positive and Negative Integers

Lesson 2: Introduction to the Number Line

Lesson 3: How to Compare Numbers on the Number Line

Lesson 4: Definition of Absolute Value

Lesson 5: How to Add Integers on the Number Line (Part 1)

Lesson 6: How to Add Integers on the Number Line (Part 2)

Lesson 7: Addition of Integers Using Chips

Lesson 8: Properties of Addition

Lesson 9: Application of Properties of Addition

Lesson 10: How to Subtract Integers Using the Number Line Part 1

Lesson 11: Subtraction of Integers Worked Examples 1

Lesson 12: How to Subtract Integers Using the Number Line Part 2

Lesson 13: Subtraction of Integers Worked Examples 2

Lesson 14: Subtraction of Integers Using Chips

Lesson 15: Addition and Subtraction of Integers Worked Examples

Lesson 16: Summary of Addition and Subtraction of Integers

Lesson 17: Introduction to Multiplication of Integers

Lesson 18: Multiplication of Integers Worked Examples

Lesson 19: Properties of Multiplication

Lesson 20: How to Use the Exponent Notation

Lesson 21: Division of Integers

Lesson 22: Division of Integers Worked Examples

Lesson 23: Integer Multiplication and Division Worked Examples

Lesson 24: Introduction to PEMDAS

Lesson 25: The Distributive Property

**Ratio and Proportion**

Lesson 1: Ratio and Proportion Definition, Representation of Ratio

Lesson 2: Ratio Sample Problem 1

Lesson 3: Ratio Sample Problem 2

Lesson 4: Ratio Sample Problem 3

Lesson 5: Understanding the Meaning of Proportion

Lesson 6: Proportion, Equivalent Fractions, and Cross Multiplication

Lesson 7: Ratio and Proportion Sample Problem 1

Lesson 8: Ratio and Proportion Sample Problem 2

Lesson 9: Ratio and Proportion Sample Problem 3

Lesson 10: Ratio and Proportion Sample Problem 4

**Scientific Notation**

Lesson 1: Introduction to Scientific Notation

Lesson 2: Multiplying Numbers by Positive Powers of 10

Lesson 3: Multiplying Numbers by Negative Powers of 10

Lesson 4: Writing Numbers in Scientific Notation Part 1

Lesson 5: Writing Numbers in Scientific Notation Part 2

Lesson 6: Writing Numbers in Scientific Notation Part 3