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许多林业部门在统计造林或有林面积时,用已知株数除以166.7,即166.7株折合一亩,这在计算上很不方便,得用笔或电子计算器,很难用口算。並且,严格说来,166.7是不准确的,因为尾数7是四舍五入所得,其实是无穷多个6。为了计算方便和精确,我们可以用已知株数乘6,然后将小数点往前推三位,便是亩数。例:已知某场造林120000株。120000×6=720000,小数点往前推三位,就是720亩。
In calculating the area of afforestation or afforestation, many forestry departments use the known number of trees divided by 166.7, or 166.7 plants per acre, which is very inconvenient in terms of calculation. It is difficult to calculate with a pen or electronic calculator. And, strictly speaking, 166.7 is inaccurate because the mantissa 7 is rounded off, in fact an infinite number 6. In order to calculate convenient and accurate, we can use the known number of plants by 6, and then push the decimal point three, is the number of acres. Example: It is known that a plantation of 120,000 plants. 120000 × 6 = 720000, pushing the decimal point forward three, that is, 720 acres.