Find the multiple of 40

Let's play "Find the multiple of 40!" This is how it works: There is one number in each of the boxes below, but only one of the numbers is a multiple of 40. Without using a calculator, see if you can find the only multiple of 40.

Find the multiple of 41
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Find the Multiple
Do you want to play "Find the Multiple" for a particular number? If so, please enter it below and press "Play."

Multiples of 40
Do you know that there are more multiples of 40 than there are stars in the universe? Go here to learn all about the multiples of 40.