"How much do you know about big numbers" PPT courseware 5

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"How much do you know about big numbers" PPT courseware 5

Review the comparison of numbers within ten thousand

1. fill in the blank.

211010 is the ( ) digit, the highest digit is the ( ) digit,

read:( )

2. Fill in ○ with ">", "<" or "=".

999○1010 601○564 687○678

Can anyone tell me how to compare two numbers within ten thousand?

How to compare numbers within 10,000:

1. When the digits are different, the number with more digits is larger;

2. When the digits are the same, then the number with the larger number on the first digit from the left is larger; if the numbers on the first digit from the left are the same, compare the number on the second digit from the left...

What if the digits are the same?

Which one has the larger population, the United States or Russia?

Which one is bigger, China or the United States?

If the digits are the same, the number with the larger number in the first position from the left is larger.

If the first one from the left is also the same, then compare the second one from the left...

Tips for comparing two numbers

When comparing two numbers, look at the digits first.

The one with more digits is bigger, and the one with fewer digits is smaller.

When the digits are the same, look at the high digit.

The big one in the high position is big, and the small one in the high position is small.

When the high positions are the same, search downwards in order.

1. Compare the sizes of two numbers and tell who compares how.

93250 ( ) 100250 130000 ( ) 310000

79020( )79202 210001( )209999

Sometimes, for the convenience of reading and writing, the numbers in ten thousand and hundreds of millions are rewritten into numbers using "ten thousand" or "hundred million" as the unit.

Rewrite the following numbers into numbers using "ten thousand" or "hundred million" as units.

(1) The volume of a small cloud droplet must expand to about 1,000,000 times before it can become an ordinary-sized raindrop.

(2) The Sahara Desert in Africa covers an area of ​​approximately 8.6 million square kilometers.

(3) There are approximately 14000000000 brain cells in the human brain

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Update Time: 2024-12-03

This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 1 industry PPT template

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