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How can I master the number of copies of the next volume of mathematics in the fifth grade of primary school?
Divide a 3-meter-long piece of wood into five equal parts. How much is each part? Because there are five copies, each copy is 1, so it is 1/5= one fifth.

What is the percentage of 2 copies in the total length? Because there are five copies and two copies, it is 2/5= 2/5.

Each length? The total length is 3 meters, and it is divided into 5 parts on average, and one part is 3/5=0.6 meters.