basic maths references

number systems


counting numbers


	natural numbers				1, 2, 3, 4

	roman numerals				XII

	binary, hexadecimal, octal		0111, FA, 61

		[decimal systems, other bases]


	pictographic number systems		XAA



location numbers


	real numbers				12.31, -1.3

	2-d numbers				628312

	complex numbers				2 + 3i



proportion split of an item

	percentages

	real numbers				0.8

	fractions				1/3



