**No zero.**"W" represents whole numbers; 0,1,2,3,...

**With zero**. "I" stands for integers;...-1,0,1,...numbers found

**In the number line**. "R" represents rational numbers, any number that can be written as a fraction.

**Rational is "fractional".**We also explain how fractions can be written as decimals. Numbers that do not fall into any of the above categories are Irrational numbers such as Pi.

The above letters are placed in a triangle with the Natural Numbers at the top going in order with the Rational Numbers on the bottom. This visual tool shows for example that all natural numbers are rational, but not all rational numbers are natural.

I've been struggling to find a way to teach the number system to my inclusion kids and this definitely helps! Thank you!

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