(1) Use these five pieces of paper to make a figure with a circumference equal to 12 decimeter. (Draw at least three kinds of figures)
(2) Use these five pieces of paper to make a figure with a circumference equal to 10 decimeter. Draw a picture casually. )
2. There is a 40 cm iron wire around two squares with integer sides. Draw these two squares and mark their side lengths.
3. Gardeners should plant trees equidistantly at the edge of a circular flower bed with a circumference of 300 meters. They first dug a hole every 3 meters along the edge of the flower bed. When they finished digging 30 holes, they were suddenly told that they would plant a tree every 5 meters instead. In this way, how many holes will they have to dig to complete the task?
4. When Xiao Qiang calculates the division, he writes the divisor 76 as 67, and the quotient is 15, leaving 5. What is the correct quotient?
5. A bookshelf has three layers of books, and there are 270 books. Take out 20 books from the first floor and put them on the second floor. Take out 17 books from the third floor and put them on the second floor. At this time, the number of books on the three shelves is equal. How many books are there on the first, second and third floors?
4. Xiao Fang and Xiaoqiang weigh 74kg, Xiao Min and Xiao Fang weigh 7 1 kg, Xiao Min and Xiaoqiang weigh 67kg, and how many kilograms are Xiao Fang, Xiaoqiang and Xiao Min?
5. There are two ropes. The length of the white rope is four times that of the red rope, less than 2 meters. If the white rope is18m long, how many metres is the red rope?
6. Interest groups are organized in the school. The chorus number is three times that of the instrumental band, and the dance team is eight people less than the instrumental band. There are 24 people in the dance team. How many people are there in the choir?