I can't help you with the missing length, since you haven't told me anything about the shape of whatever has the missing length. As for the rounding...
Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to, in this case, the ones place. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out. If your target digit is 9, it will become a zero and increase the digit to the left of it by one.
11.70
LM = 4 in LN = ? Find LN. Round the answer to the nearest tenth.
Only if you were asked to find the mean to the nearest tenth. If so, don't round each number; calculate the mean first and then round it to the nearest tenth.
To find the nearest square unit of a given area, first calculate the square root of the area to determine the side length of the square. Round this side length to the nearest whole number, then square that rounded value to find the nearest square unit. For example, if the area is 20, the square root is approximately 4.47, rounding to 4 gives a nearest square unit of 16 (4²).
Round to the nearest cent.
Say you approximate a length of a line.approximation to the nearest ten means you find the tens column. e.g.25632 - in this case the '32'then you round it. to 25630from 0 - 4 you round downwards, from 5 - 9 you round upwards so...248 goes to 250 for example.
To find the missing length of a triangle
Of what?
2.3
Round to the nearest dollar.
The two nearest hundreds for 31,745 are 31,700 and 31,800. To find these, you round down to the nearest hundred for 31,700 and round up to the nearest hundred for 31,800.
Round the number to the nearest tenth.