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本单元是在乘数、除数是一、两位数的基础上进行教学的。主要内容包括乘数是三位数的乘法,除数是三位数的除法,乘、除各部分间的关系以及乘、除法中的一些简便运算四个部分。一、乘数是三位数的乘法这一节主要教学,乘数是整百数的口算,乘数是三位数乘法的笔算和乘法估算。我们必须十分重视乘数是整百数的口算教学,因为这个内容既是学生理解乘数是三位数的乘法法则的前提,又是学生正确进行乘法笔算所必需的口算技能之一。教学时首先讲清算理,可先通过直观图示,启发学生观察得出:交
The unit is in the multiplier, divisor is one, two-digit basis for teaching. The main contents include the multiplier is a three-digit multiplication, the division is the three-digit division, multiplication, addition to the relationship between the various parts and multiplication, division of some of the simple operation of four parts. First, the multiplier is a three-digit multiplication This section main teaching, multiplier is the whole hundred mouth count, multiplier is the three-digit multiplication of the pen calculation and multiplication estimation. We must pay great attention to the fact that the multiplier is an integral part of the oral arithmetic, as this is both a prerequisite for students to understand multiplication rules that give a three-figure multiplier and one of the numeracy skills necessary for a student to do the correct multiplication. When teaching first clarify the calculation, first through the visual icon, inspire students to observe: pay