Arithmetic

The most basic of the math playlists. Start here if you have very little background in math fundamentals (or just want to make sure you do). After watching this playlist, you should be ready for the pre-algebra playlist.

Lectures

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   Lecture 1 - Basic Addition

   Introduction to Addition. Multiple Visual Ways to Represent Addition.

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   Lecture 2 - Addition 2

   Adding 2-digit Numbers.

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   Lecture 3 - Level 2 Addition

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

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   Lecture 4 - Addition 3

   Practice Carrying Digits to Add Multiple Digit Numbers.

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   Lecture 5 - Addition 4

   More Practice Carrying with Multiple Digit Numbers.

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   Lecture 6 - Basic Subtraction

   Introduction to Subtraction.

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   Lecture 7 - Subtraction 2

   Different Ways to View Subtraction.

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   Lecture 8 - Subtraction 3: Introduction to Borrowing or Regrouping

   Introduction to Borrowing and Regrouping.

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   Lecture 9 - Alternate Mental Subtraction Method

   How I Subtract in My Head.

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    Lecture 10 - Why Borrowing Works

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

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    Lecture 11 - Level 4 Subtraction

    Subtraction of Multi-digit Numbers Involving Borrowing.

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    Lecture 12 - Adding Decimals

    Adding Decimals.

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    Lecture 13 - Subtracting Decimals

    Subtracting Decimal Numbers.

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    Lecture 14 - Basic Multiplication

    Introduction to Multiplication.

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    Lecture 15 - Multiplication 2: The Multiplication Tables

    Introduction to the Multiplication Tables From 2-9.

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    Lecture 16 - Multiplication 3: 10,11,12 Times Tables

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

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    Lecture 17 - Multiplication 4: 2-digit Times 1-digit Number

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

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    Lecture 18 - Multiplication 5: 2-digit Times a 2-digit Number

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

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    Lecture 19 - Multiplication 6: Multiple Digit Numbers

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

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    Lecture 20 - Multiplication 7: Old Video Giving More Examples

    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.

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    Lecture 21 - Mulitplication 8: Multiplying Decimals (Old video)

    Multiplying decimals.

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    Lecture 22 - Lattice Multiplication

    Introduction to Lattice Multiplication.

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    Lecture 23 - Why Lattice Multiplication Works

    Understanding Why Lattice Multiplication Works.

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    Lecture 24 - Division 1

    Introduction to Division.

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    Lecture 25 - Division 2

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

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    Lecture 26 - Division 3: More Long Division and Remainder Examples

    More Long Division and Remainder Examples.

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    Lecture 27 - Level 4 Division

    Dividing a Two Digit Number into a Larger Number.

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    Lecture 28 - Converting Fractions to Decimals

    How to Express a Fraction as a Decimal.

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    Lecture 29 - Percent and Decimals

    Expressing Percentages as Decimals. Expressing Decimals as Percentages.

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    Lecture 30 - Dividing Decimals

    Dividing Decimal Numbers.

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    Lecture 31 - Ordering Numeric Expressions

    Ordering Numbers Expressed as Decimals, Fractions, and Percentages.

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    Lecture 32 - Greatest Common Divisor

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

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    Lecture 33 - Least Common Multiple

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

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    Lecture 34 - Equivalent Fractions

    Introduces the concept of equivalent fractions.

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    Lecture 35 - Mixed Numbers and Improper Fractions

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