The answer is 410.
Rounding "to the nearest ten" means turning a number into the nearest number that can be divided by ten. This is the same as the nearest number that ends in a zero.
409 is nearer to 410 than to 400 or 420 or any other number ending in a zero.
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turn the 409 into 400
round to the nearest ten thousandth 44.24862486
96 round to the nearest ten=100
300
645 rounded to the nearest ten would simply be 650.