39 is does not round to the hundreds place. It is closer to zero than it is to 100.
0
39 to the nearest hundreds is zero.
round 90 to the nearest ten
45 + 39 = 84, so if you want to round to the nearest ten, that's 80, or nearest hundred is 100. Otherwise, it doesn't turn out to a decimal, so it doesn't need rounding to the nearest one.
39 is what % of 79. then Round to the nearest hundredth.
39 rounds to 40.
372 rounded to the nearest hundred is 400
300
39% of 62 = 62*39/100 = 24.18 = 24.2 to the nearest tenth
100
100