Maths — Number Representation and Place Value + 7 more topics

Our everyday number system is called the decimal system, which means it's base-10. This base-10 idea is crucial: it means that the value of each place is ten times greater than the place to its right.

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A fraction is a way to show a part of a whole. It has two main parts:
* The numerator (top number) tells you how many parts you have.
* The denominator (bottom number) tells you how many total equal parts make up the whole.

For example, in the fraction $\frac{1}{2}$, you have 1 part out of 2 total equal parts.

You already know the basic four arithmetic operations:

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To add or subtract fractions, you must make sure the bottom numbers (denominators) are the same. If they aren't, you need to find a common denominator. The easiest common denominator to find is the least common multiple (LCM) of the original denominators.

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Word problems can seem tricky because they don't immediately give you an equation to solve. You need to pull out the math from the story.

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Divisibility rules help you quickly determine if a number can be divided by another number without leaving a remainder. Let's look at the most common ones.

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