How many multiples of 3 are there from 40 to 1000?

$${\frac{{\mathtt{1\,000}}}{{\mathtt{3}}}} = {\mathtt{333.333\: \!333\: \!333\: \!333\: \!333\: \!3}}$$

$${\frac{{\mathtt{40}}}{{\mathtt{3}}}} = {\mathtt{13.333\: \!333\: \!333\: \!333\: \!333\: \!3}}$$

333-13=320

320

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How did you come up with that answer Alan? .-.

Oooh I see. Thanks :D

You learn something new everyday. 

Or just

$${\frac{\left({\mathtt{1\,000}}{\mathtt{\,-\,}}{\mathtt{40}}\right)}{{\mathtt{3}}}} = {\mathtt{320}}$$