If you subtract 7 from the two-digit number, the difference is 3 more than the value of the minuend; This is equivalent to subtracting 10 and adding 3.
Through independent thinking and cooperative communication, this lesson understands the calculation of more than ten MINUS eight and masters the calculation method. Make students have a preliminary sense of inquiry and cooperation and communication.
Teaching emphasis: the arithmetic and calculation method of using "breaking ten method" to calculate ten MINUS eight or more.
Teaching difficulties: the arithmetic and calculation method of calculating more than ten MINUS eight by "breaking ten"
Two-digit minus 8: Through students' practical operation and cooperative communication, students' initiative in learning can be brought into play, and teachers can give timely guidance, which conforms to the position of teachers and students in the teaching process in the curriculum standards. Using the method of "breaking 10", students can correctly calculate the two-digit MINUS 8.