If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up (+1).
If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).
\(243.8\underline{7}5\approx243.9\\\\243.87\underline{5}\approx243.88\\\\2\underline{4}3.875\approx200\)