初一数学open－ended题目（英文）

初一数学open－ended题目（英文）
1.Write down a percentage with a value greater than twenty-three over twenty five.
2.If 10m+n=10n+m,suggest two pairs of possible values of m and n.
3.A wire is first bent into a square with sides of 9cm.It is then bent into a rectangle with an area greater than 70㎠.Find two possible dimensions of the rectangle.
4.The base and the height of a triangular metal plate are 8cm and 4cm respectively.The metal plate is melted and recast into a metal plate in the shape of a trapezium with a height the same ad that of the triangle.Find two possible pairs of the lengths of the shorter base and the longer base of the new metal plate.(Hint:The thickness of metal plates can be ignored.)
5.How can we draw 240° using a protractor in the shape of a half circle?Explain you answer briefly.
我想了很久很久也想不到答案啊～悲催～thank you～额⋯⋯那个,answer in English.