350
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.
350
350
350
650
350
30
It is: 350 rounded to the nearest ten
340
400
350