Answer
(a) 186.0
(b) 763.0
Work Step by Step
(a) Draw a "cut-off" line after the tenths place: "185.9". Next, look at the first number after the cut-off line: "8". If the number is 5 or above, round up to the nearest tenth: "186.0".
(b) Draw a "cut-off" line after the tenths place: "763.0". Next, look at the first number after the cut-off line: "4". If the number is 4 or below, round down to the nearest tenth: "763.0"
Note: You are rounding to the nearest tenth, so show the "0" in the tenth's place (186.0 and 763.0, not 186 and 763).