They could be: 350, 360, 370, 380 and 390 rounded to the nearest
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There are 300 whole numbers between 100 and 400, inclusive. To find this, you subtract 100 from 400 to get the total range of numbers (400 - 100 = 300). Then, since we're considering whole numbers, we add 1 to include the endpoints (400 and 100). Therefore, there are 300 whole numbers between 100 and 400.
Half of 100 is 50, so the largest number that ought to round to 400 to the nearest 100 would be 400 + 50 = 450; however, numbers exactly half way round up, so the largest whole number that rounds to 400 is one less than this, namely 450 - 1 = 449.
These are the whole numbers that go into 400 evenly: 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400.
Your three hundred ninety-five (395) rounded to the nearest ten (10) is four hundred (400). The rule is that a five (5) or higher number rounds up. Numbers four (4) and lower round down.
what is a whole number for 400