340
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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.
345 rounded to the nearest tenth is 345. There is no change.
The smallest number to be rounded to 350 would be any number greater than or equal to 345 but less than 355. This is because when rounding to the nearest 10, any number 5 or greater will round up. Therefore, the smallest number that, when rounded to the nearest 10, would result in 350 is 345.
840
340