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995 to the nearest tens is 1000. When rounding to the nearest tens, you look at the digit in the ones place. If it is 5 or greater, you round up; if it is less than 5, you round down. In this case, the digit in the tens place is 9, which is 5 or greater, so you round up to the nearest tens, which is 1000.
The answer depends on what the tens digit is greater than, and what the ones digit does then.
There is an infinite number of values between 40 and 50, or between 4/10 and 5/10. Try 45 in the first case, and 9/20 in the second.
When rounding 785 to the nearest tens place (which is 790), we look at the digit in the ones place, which is 5. Since 5 is equal to or greater than 5, we round up the digit in the tens place to 9. Therefore, 785 rounded to the nearest tens place is 790.