Subtraction – reverse addition!
A boy walking backwards Subtracting numbers is just the same as adding them, only walking the other way along the number line. To subtract 3 from 8, you start on the number [...]
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07, 2017
Multiplication and multiplication games
Walk along a chalk line Multiplying numbers is like jumping along the number line, with all your jumps the same size. It's the same thing as addition, except that you repeat [...]
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07, 2017
Simple operations – fun with math
Walk along a chalk line The four basic things you do with numbers are addition, subtraction, multiplication, and division. Each of these is basically a way of describing how fast you are moving along [...]
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07, 2017
Commutative project – Chalk number line
Walk along a chalk line To get to understand the number line better, mark out a line on the playground or on the sidewalk outside your house with chalk. At the middle of [...]
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07, 2017
Division – math operation
How many of these things can I fit into these boxes? Division is a way of answering the question: how many of these things can I fit into that box? [...]
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07, 2017
Commutative property of addition
A number line is infinite in both directions. When people say that addition is commutative, that means that it doesn't matter what order you add up the numbers. 3 + 6 [...]
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07, 2017
Addition – How to add whole numbers
A number line is infinite in both directions. Adding numbers is like walking along a path, the number line. To add two small numbers, like 7 + 4, you can just [...]
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07, 2017
What are whole numbers? – Math
A number line is infinite in both directions. Whole numbers are the numbers you learned when you were first learning to count - one, two, three, four, five and so [...]
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07, 2017
Percents, fractions, and decimals
Each penny is 1% of a dollar. Percent comes from the Latin words "per cent". That means "out of a hundred," like there are 100 cents in a dollar. So [...]
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07, 2017
Which one is the numerator? Fractions
A pie cut into thirds The numerator of a fraction is the number on the top, just as the denominator is the number on the bottom. In the fraction 1/2, the numerator is one, and in [...]
