Look at the last digit. If it is a zero, it does not need to be rounded.
4870 does not change.
If it is 1, 2, 3 or 4, it is rounded down, replacing that digit with a zero.
5214 becomes 5210.
If it is 5, 6, 7, 8 or 9, it is rounded up, so the digit becomes zero and the digit beside it is incremented by one.
8176 becomes 8180.
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120
To round 8.12 to the nearest ten, we look at the digit in the tens place, which is 0. Since 0 is less than 5, we keep the digit in the tens place the same and change all digits to the right of the tens place to zero. Therefore, rounding 8.12 to the nearest ten gives us 10.
Your question is obviously missing something. I'm pretty sure that you meant to ask what is the greatest 2 digit number that is still a 2 digit number when rounded to the nearest 10. The answer could be 94 or 95, depending upon how you round 95. 95 could be rounded to 90 or to 100, since it is exactly half way between 90 and 100. There is no hard and fast rule regarding how you should round a number ending in 5.
Since the last digit is over 5, than you round up to 730.
It depends on how precise you want to be. To round to the nearest tenth, you would observe that the digit n the thousands position is 1, which is closer to 0 than to 10 so you would round down to get 35.7 To round to the nearest whole number, you would observe that the digit n the tenths position is 7, which is closer to 10 than to 0 so you would round up to get 36. To round to the nearest ten, you would observe that the digit n the ones position is 5 (and that there is a bit more in the decimal spots), which is closer to 10 than to 0 so you would round up to get 40. To round to the nearest hundred, you would observe that the digit n the tens position is 3, which is closer to 0 than to 10 so you would round down to get 0.