Two-digit multiplication Write three-digit multiplication by multiplying each digit of the first factor by the number of the second factor, then multiplying each digit of the first factor by the number of the tenth, and finally adding the two results.

Be careful not to misplace or omit to add carry.

Three-digit times two-digit is the content of Unit 3, Book 1, Experimental Textbook for Grade Four in the Curriculum Standard of People's Education Press. Students have learned the written multiplication of three-digit times one-digit times two-digit times in the second volume of Grade Three, and the algorithm and calculation of two-digit times two-digit times will be realized directly in three-digit times two-digit. Therefore, students will not find it difficult to understand and explore computing power and algorithms. The teaching goal is to explore the calculation method of multiplying three digits by two digits, master the written calculation method of multiplying three digits by two digits, cultivate students' estimation consciousness in combination with specific conditions, let students gain experience in solving new calculation problems with existing knowledge, and cultivate students' ability to transfer analogy and solve simple practical problems.