3.7 is rounded up to 4.
if the numbers after the decimal point (in this case 7) are higher than 5, it is rounded up.
Other examples are: 2.45. The 45 means that it is less than a half, so it is rounded down to 2
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37 is an integer and so already rounded to a greater degree than required.
37.0
37 rounded to the nearest 10 is 40.
10
37 and 3/4 inches is, 37.75 ----------so, this is much closer to 38 inches than 37 inches.