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What between 4 and 5 in number lines?
There are infinitely many numbers between any two different numbers. To find a number exactly in the middle between two numbers, calculate the average. That is, add the two numbers, then divide the result by 2.
What makes an odd number odd?
Even numbers can be matched up in two lines. Odd numbers have one left over.
How were numbers named?
Numbers were named after the number of angles they represented, and each angle represented a quantity. For example, the number one has one angle, number two two and so on. They have to be written with straight lines (not curved).
What is two perpendicular number lines or axes used for graphing ordered pairs of numbers?
Coordinate planes
What does each number represent?
Typically a number is used to represent the exact amount of things you are counting. Numbers in telephone numbers actually don't count anything and were just a convenient way to categorize lines.
