When rounding a decimal number to the nearest whole number, you look at the first decimal place. If the number is 5 or greater, you round up; if it is less than 5, you round down. In this case, 2.42 is closer to 2 than to 3, so when rounded to the nearest whole number, it becomes 2.
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240
Expressed as a surd in its simplest form, sqrt(242) = 11 sqrt(2). Expressed as a decimal, rounded to two decimal places, this is equal to ±15.56.
Half of 242 is 121. To find half of a number, you simply divide it by 2. In this case, 242 divided by 2 equals 121. This can be calculated by long division or by mentally halving the number.
121. Odd.
You can't tell the dimensions from the area. There are an infinite number of possibilities, all with the same area. Here are a few possibilities for your 1 acre: -- a circle with diameter 117.75 feet (rounded) -- a square with sides of 208.71 feet (rounded) -- any of the following rectangles, and an infinite number of others: 10 x 484 yards 20 x 242 yards 40 x 121 yards 50 x 96.8 yards 90 x 484 feet 121 x 360 feet 180 x 242 feet