Arithmetic

Introduction to Addition. Multiple Visual Ways to Represent Addition.

Adding 2-digit Numbers.

Adding a 2 Digit Number to a 1 Digit Number. Introduction to Carrying.

Practice Carrying Digits to Add Multiple Digit Numbers.

More Practice Carrying with Multiple Digit Numbers.

Introduction to Subtraction.

Different Ways to View Subtraction.

Introduction to Borrowing and Regrouping.

How I Subtract in My Head.

An Explanation of Why (not how) Borrowing/regrouping Works When Subtracting Numbers.

Subtraction of Multi-digit Numbers Involving Borrowing.

Adding Decimals.

Subtracting Decimal Numbers.

Introduction to Multiplication.

Introduction to the Multiplication Tables From 2-9.

Multiplication 3: Learning to Multiply 10, 11, and 12.

Multiplying a 2-digit Times a 1-digit Number.

Multiplying a 2-digit Number Times a 2-digit Number.

Working Our Way Up to Multiplying Multiple-digit Numbers With Each Other.

2 Examples of Multiplying a 3 Digit Number Times a 2 digit Number. 1 Example of Multiplying a 3 Digit Number Times a 3 Digit Number.

Multiplying decimals.

Introduction to Lattice Multiplication.

Understanding Why Lattice Multiplication Works.

Introduction to Division.

Dividing into Larger Numbers. Introduction to Long Division and Remainders.

More Long Division and Remainder Examples.

Dividing a Two Digit Number into a Larger Number.

How to Express a Fraction as a Decimal.

Expressing Percentages as Decimals. Expressing Decimals as Percentages.

Dividing Decimal Numbers.

Ordering Numbers Expressed as Decimals, Fractions, and Percentages.

4 example Problems of Determining the Greatest Common Factor of Two Numbers by Factoring the 2 Numbers First.

Example of figuring out the least common multiple of two nunmbers.

Introduces the concept of equivalent fractions.

Converting mixed numbers to improper fractions and improper fractions to mixed numbers.