Cool Math
Coolmath: Coolmath4kids: Lessons
A large collection of tutorials covering concepts in addition, subtraction, multiplication, division, and fractions.
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Coolmath: Coolmath4kids: Polyhedra Gallery
A gallery of complex polyhedra with descriptions and characteristics.
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Coolmath: Coolmath4kids: Ten Frames
An interactive for working with ten frames or a variation of one. Choose characters or shapes for counters and lay them out in your frame. There are tools for duplicating, rotating, drawing, and deleting, as well as for typing an...
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Coolmath: Coolmath4kids: Multiplying Fractions and Whole Numbers
Demonstrates how to multiply a fraction by a whole number or a mixed number. Includes two example problems to try.
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Coolmath: Coolmath4kids: Adding Numbers Within 100 With Regrouping
Demonstrates how to regroup when adding 2-digit numbers.
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Coolmath: Coolmath4kids: Division Quiz
A customizable division quiz where you can choose what numbers to cover, from 10 to 30 questions, and how much time students can have to answer. The quiz can also be printed for use as a worksheet.
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Coolmath: Coolmath4kids: Subtraction Quiz
A customizable subtraction quiz where you can choose what numbers to cover, from 10 to 30 questions, and how much time students can have to answer. The quiz can also be printed for use as a worksheet.
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Coolmath: Coolmath4kids: Multiplication Quiz
A customizable multiplication quiz where you can choose what numbers to cover, from 10 to 30 questions, and how much time students can have to answer. The quiz can also be printed for use as a worksheet.
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Coolmath: Coolmath4kids: Addition
A set of seven short tutorials on addition. Begins with a basic introduction to how addition works, and covers topics such as using a number line, place value, and regrouping.
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Coolmath: Coolmath4kids: Scratch Addition
Demonstrates a method for easily adding long vertical columns of numbers. Includes two sample problems to try.
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Coolmath: Coolmath4kids: Subtraction: Fact Families
Explains what fact families are for addition and subtraction and includes sample problems to try.
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Coolmath: Coolmath4kids: Yardstick Subtraction
Demonstrates how to use a yardstick as a number line for simple subtraction.
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Coolmath: Coolmath4kids: Subtraction: Place Value Review
Reviews what place value is and how it is used in subtraction.
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Coolmath: Coolmath4kids: Subtracting Numbers Within 100
Short tutorial showing how to subtract using two-digit numbers in tens and ones columns without regrouping.
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Coolmath: Coolmath4kids: Lattice Multiplication
Demonstrates step by step how to use the lattice method for multiplying numbers.
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Coolmath: Coolmath4kids: Division: Standard Algorithm
Short tutorial that breaks down simple division step by step using the standard algorithm where you divide, multiply, and subtract, then repeat. Includes sample problems to try.
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Coolmath: Coolmath4kids: What Are Fractions?
Explains what fractions are using visual models and includes sample problems to try.
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Coolmath: Coolmath4kids: Fractions: Mixed Numbers
Uses visual models to explain what mixed numbers are and includes sample problems to try.
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Coolmath: Coolmath4kids: Fractions: The Magic 1
Explains how the number one can also be a fraction.
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Coolmath: Coolmath4kids: Equivalent Fractions, Part 1
Explains what equivalent fractions are using visual models and includes sample problems to try.
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Coolmath: Coolmath4kids: Equivalent Fractions, Part 2
Short tutorial explaining how to identify equivalent fractions and how to find additional ones. Includes sample problems to try.
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Coolmath: Coolmath4kids: Simplifying Fractions
Short tutorial explaining how to simplify fractions. Includes sample problems to try.
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Coolmath: Coolmath4kids: Improper Fractions
Explains what improper fractions are, how to convert one into a mixed number, and how to change a mixed number into an improper fraction.
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Coolmath: Coolmath4kids: Compare Fractions: Equal Denominator
Demonstrates strategies for comparing fractions by using pizza as a visual model. Includes sample problems to try.