It is 420.
420
420
400
That would depend on what you were rounding it to. If rounding to the nearest whole number, then it does not need rounding. If rounding to the nearest ten, it would be 420. If rounding to the nearest hundred, it would be 400.
478.5
To the nearest tens, 10 To the nearest ones, 10 To the nearest tenths, 10.5 To the nearest hundredths, 10.48
420.
400
415 is already rounded to the nearest tenths place as well as to the units place.
10%off 415 = 415 - (0.10 x 415) = 373.5
10% of 415 is 41.500
10 + 3 + 412 - 10 = 415
420
415 divided by 27 is approximately 15.37
400
It is: 2 and 83 when simplified
That would depend on what you were rounding it to. If rounding to the nearest whole number, then it does not need rounding. If rounding to the nearest ten, it would be 420. If rounding to the nearest hundred, it would be 400.
4.15 x 10^2