Unit 6 multiplies a number by a number.

1, oral calculation. Multiply the numbers of whole ten, whole hundred and whole thousand by one digit. You can first convert the topic into a number multiplied by a digit and calculate it directly with the multiplication formula. After calculating the product, look at how many zeros are at the end of the factor * * *, and add a few zeros at the end of the product.

2. Calculation method of multiple digits multiplied by one digit: calculate two digits or three digits multiplied by one digit, and multiply the digits on each digit of this multiple digit by one digit in turn. If the product of one digit is more than dozens, it is necessary to advance several digits.

Multiply 3, 0 and any number to get 0.

4. Estimation of multiple digits multiplied by one digit. Imagine the two or three digits in the factor as the nearest integer ten meters or hundred meters multiplied by one digit. For example: 48X9≈ Think of it this way: Because 48 is close to 50, 50X9=450, 48X9≈450.

Mathematics learning methods in grade three

1, calculation is the foundation, and the foundation should be firmly laid: the third grade mathematics textbook system introduces four operations and their ingenious calculations. The calculation of numbers is boring, but it is also the basis of learning mathematics well and an indispensable part of previous competitions or selection competitions.

According to the teaching experience of teachers in our school, students who have laid a good foundation of operation in the second and third grades will make their future mathematics study easier, and on the other hand, they will often have considerable advantages in the competition or selection of senior grades.

2. Application questions, the most important thing: From the third grade, a large number of mathematics topics, especially application questions, have been introduced into mathematics textbooks, which are the key knowledge that must be tested in all competitions and exams in all grades. Students must lay a good foundation in the early stage of special study of various application problems.

At present, it is difficult for many students in Grade 5 and 6 to improve their math level because their knowledge of math problems in Grade 3 is unreliable.

3. Learning methods are very important: on the basis of learning and calculation in the third grade, mathematical knowledge such as basic application problems and simple graphics problems are gradually introduced. Facing the sudden increase of mathematics information, students can consciously cultivate good study habits such as review and summary;