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在教学时间的认识时经常遇到一些有关时间的计算,即求经过的一段时间。教材从最简单的入手,如:9:05→9:20这一段时间是多少。教材介绍的方法一:让学生看分针转动了3个大格,每大格5分钟,这样3个5分是15分钟,可列式为3×5或5×3,直接口答15分钟。方法二:直接列式20-5=15(分钟)。但随着学习的深入,教材或练习中就出现了稍复杂的求经过的一段时间的试题,学生就不知道怎样计算了,而且教材中也没有规范的书写格式。有时连老师们都出现了不同的方法,甚至是有争议的算式。我在思
In the understanding of teaching time often encounter some calculation of time, that is, the passage of time. Teaching materials from the most simple start, such as: 9: 05 → 9:20 this period of time is much. Textbook introduction method one: let the students watch the rotation of the three major grid, each big grid 5 minutes, so that 3 5 minutes is 15 minutes, can be expressed as 3 × 5 or 5 × 3, direct mouth answer 15 minutes. Method two: Direct expression 20-5 = 15 (minutes). However, with the deepening of learning, the textbooks or exercises appear a little complex for a long period of time, the students do not know how to calculate, and the textbooks nor normative writing format. Sometimes even teachers have appeared in different ways, and even controversial formula. I’m thinking