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.
415 = CDXV as a Roman numeral
420.
400
10%off 415 = 415 - (0.10 x 415) = 373.5
415 has these factors: 1, 5, 83, 415.
CDXV = 415
75% of 415= 75% * 415= 0.75 * 415= 311.25
The positive integer factors of 415 are: 1, 5, 83, 415
415=4.15x102
Probably 415.
665-415 = 250
No.415 / 3138.33333...