1, so that students can understand the decimal counting method, know the counting units of tens of thousands and billions, and master the numerical sequence table within 100 billion. Understand and master the composition of tens of thousands and hundreds of millions of numbers, and be able to read and write multiple numbers correctly. Will use an abacus to represent multiple numbers. Will compare the size of multiple digits and rewrite tens of thousands or hundreds of millions of integers into numbers with tens of thousands or hundreds of millions as units. To understand the meaning of divisor, we can find the divisor of a number by "rounding".

2. Make students experience the process of abstracting numbers from real situations, feel the actual size of large numbers, describe the specific number of some things in life with large numbers, and get a good sense of numbers. Be able to think and express in an orderly way, develop thinking ability and problem-solving ability.

3. Make students feel the wide application of large numbers in daily life in the process of understanding multi-digits, and cultivate the habit of independent thinking and cooperative communication. Enhance the courage to overcome difficulties and establish confidence in learning mathematics well.