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Mathematics Lessons - 10 (Arithmetic Review For College)


This is a series of mathematics lessons that will review the important topics in arithmetics.

In these lessons, you will learn Approximation, Addition, Subtraction, and Multiplication of Decimals.

These lessons will also be useful as a pre-Algebra review.
The videos are presented by the Portland Community College.

Related Topics:
More Mathematics Lessons.
Previous set of video math lessons in this series.
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Math 20 - Lesson 35

Approximation of Decimals

Math 20 - Lesson 36

Addition of Decimals


Math 20 - Lesson 37

Subtraction of Decimals

Math 20 - Lesson 38

Multiplication of Decimals
1) Multiply as if they were whole numbers (that is, disregard the decimal point)
2) Count the total number of decimal places in the factor (the multipliers)
3) Starting at the right end digit of the "answer", count off the same number of places
4) If more places are needed, insert additional zeros at the front.

Errata: (205.6)(0.312) = 64.1472

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Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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