# Math

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## What is zero? Zero and place value

By |2017-07-29T17:35:52-07:00July 29th, 2017|Math|

A math problem showing place value How can you add big numbers without an abacus? You still group the sheep (or whatever) just as you did when you were using the abacus, but now you write the numbers down using place values, so that your hundreds are all underneath your other hundreds, your tens are underneath [...]

By |2018-04-24T07:58:27-07:00July 29th, 2017|Math|

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 line at 8, and walk backward three steps until you get to 5 - that's the answer: 8 - 3 = 5. Subtraction [...]

## Multiplication and multiplication games

By |2017-07-29T17:30:04-07:00July 29th, 2017|Math|

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 it a certain number of times. So if you are multiplying 4 times 3, it means 3 + 3 + 3 + 3, [...]

## Simple operations – fun with math

By |2017-07-29T17:19:22-07:00July 29th, 2017|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 the number line, and in which direction. Find out more about each of these by clicking on them! More about Addition More about Subtraction [...]

## Commutative project – Chalk number line

By |2018-04-24T07:57:26-07:00July 29th, 2017|Math|

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 the line, write 0 (zero). Going one way along the line from zero, write the positive numbers a step apart (1, 2, 3, [...]

## Division – math operation

By |2017-07-29T17:11:41-07:00July 29th, 2017|Math|

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? If you divide nine by three, that's the same as asking this question: if I have a box that will fit nine things, [...]

By |2017-07-29T17:08:44-07:00July 29th, 2017|Math|

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 = 9, and also 6 + 3 = 9. Or, if you have a lot of numbers, like 3 + 1 + 4 [...]

By |2018-04-24T07:56:53-07:00July 29th, 2017|Math|

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 start from the 7 and walk forward 4 spaces, and then see where you are on the number line, and there you are [...]

## What are whole numbers? – Math

By |2017-07-29T16:57:42-07:00July 29th, 2017|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 on, all the way up to billions and trillions and past that. In addition, zero is a whole number, and so are all the [...]

## Percents, fractions, and decimals

By |2017-07-29T16:45:17-07:00July 29th, 2017|Math|

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 "ten per cent" means ten out of every hundred. A dime is ten percent of a dollar. A dollar is ten percent of [...]