340
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340
To round 345 to the nearest ten, you look at the digit in the tens place, which is 4. Since 4 is less than 5, you keep the tens digit the same and change all digits to the right to zero. Therefore, rounding 345 to the nearest ten gives you 340.
5520
It would be 200 if rounded to the nearest ten and would also be 200 if rounded to the nearest hundred.
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