Commas and points in numbers

No doubt you all know this, but here's a quick reminder:

Numbers in Spanish and in English swap their use of the comma and the decimal point.

In English, commas are used to separate thousands, millions etcetera, whereas the decimal point is used to separate (guess what?) the decimal part of a number.

5,243,568.35

In Spanish, the roles are reversed, and the point (punto) - I guess we can no longer call it a decimal point - separates out the thousands/millions, the comma being used before the decimal places:

5.243.568,35

You may think it's not so important, but take great care when completing (for example) online payment forms, as you entry may be misinterpreted if you use the number format from the wrong currency!