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From left to right, the bands represent:

• the first digit of the value
• the second digit of the value
• how many zeros to add after the first two digits
• the tolerance.

The tolerance band is always either gold     for the standard 10% tolerance, or silver     for the precision 5% tolerance. (All the resistors here are standard tolerance). The other three bands represent digits/numbers according to the following colour table:

Colour		Number	Mnemonic
Black		0	Better
Brown		1	Be
Red		2	Right
Orange		3	Or
Yellow		4	Your
Green		5	Great
Blue		6	Big
Violet		7	Venture
Grey		8	Goes
White		9	West

Because the Ohm symbol 'Ω' is a bit of a pain to use on a computer, a common convention is to suffix resistor values with a capital 'R', and kilo-Ohm and mega-Ohm values with 'K' and 'M' respectively. For example, 180Ω, 33kΩ, and 1.2MΩ become 180R (or just 180), 33K, and 1.2M.