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一位教师上“求一个数比另一个数多几(或少几)应用题”的练习课时,设计了一道“猜猜看”的题目。 教师用投影仪打出题目“小明有12元钱,小红有8元钱。________?”让学生“猜”问题并列式解答。 学生兴趣盎然,都想猜中老师的问题,个个动脑筋,急不可待地举手发言。 生A:“小明和小红共有多少钱?算式为12+8=20(元)。” 生B:“小明比小红多多少钱?算式为12-8=4(元)。”
A teacher designed a “guessing” question on the subject of “asking for a few more (or less) application questions than another.” Teachers use the projector to play the subject “Xiaoming has 12 dollars, Xiaohong has 8 dollars.”? “Students” guess “the problem side by side answer. Interesting students, all want to guess the teacher's problems, all the brains, anxious to raise their hands to speak. Student A: ”How much is the sum of Xiao Ming and Xiao Hong? The formula is 12 + 8 = 20 (Yuan).“ Student B: ”How much is Xiao Ming smaller than Xiao Xiao? The formula is 12-8 = 4 (Yuan)."