《整十整百数乘一位数的口算和估算》是苏教版小学数学三年级上册第一单元第一课时的内容,这个课时中既有整十整百数乘一位数的口算,又有接近整十整百数乘一位数的估算。这样既能使学生已经掌握的表内乘法得以自然延伸,又能使整十整百数乘一位数的口算与相应的估算有机融合,为学生自主探索并理解两三位数乘一位数的笔算方法打下基础,铺设台阶。因 “The whole hundred-odd number of one-digit port count and estimation” is the content of the first unit of the first unit of the third grade of the Sujiao version of elementary school mathematics. This class has both the whole number of one hundred and one hundred digits, Again, there is an estimate of the whole number of hundreds and multiples by one digit. This will not only enable students to have a natural extension of the table multiplication method, but also to make the entire hundred-digit by one-digit port count and the corresponding estimates of organic integration for students to independently explore and understand two or three digits by a single digit Pen calculation method lay the foundation, laying the stairs. because