教学内容 :苏教版九年义务教育六年制小学数学第十册50 -51页、练一练、练习九1 -3教学目的 :1 使学生理解质数和合数的概念 ,能正确地判断一个数是质数还是合数。2 培养学生观察、比较、抽象、概括的能力。3 培养学生自主探究的精神和独立思考的能力。教学重点 :质数和合数的 Teaching content: Sujiao version of nine-year compulsory education six-year primary school mathematics tenth book 50 -51 pages, practicing a practice, practice nine 1 -3 teaching purposes: 1 to enable students to understand the concept of prime numbers and composite number, can correctly determine a The number is prime or composite. 2 train students to observe, compare, abstract, general ability. 3 to develop students self-exploration and independent thinking ability. Teaching focus: the prime number and the number of