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"Number and Algebra" general review PPT courseware
Natural numbers, 0 and integers
When counting objects, 0, 1, 2, 3... used to represent the number of objects are called natural numbers. (That is, natural numbers include 0 and positive integers).
Not an object is represented by 0.
"0" is the smallest natural number.
"1" is the unit of natural numbers.
decimal notation
One (one), ten, one hundred, one thousand, ten thousand, one tenth, one hundredth... are all called counting units. Among them, "one" is the basic unit of counting.
10 ones are tens, 10 tens are hundreds... 10 ten billions are one hundred billion... The progression rate between every two adjacent counting units is ten. This counting method is called decimal counting.
Basic properties of fractions
If the numerator and denominator of a fraction are multiplied or divided by the same number (except zero) at the same time, the magnitude of the fraction remains unchanged.
If the denominator of a fraction remains unchanged and the numerator is multiplied by 3, then the fraction ( )
If the numerator remains unchanged and the denominator is divided by 5, then the fraction ( )
Movement of decimal point digits causes changes in decimal size
Move the decimal point one, two, or three places to the right (left)...the original number will expand (shrink) 10 times, 100 times, 1000 times...
If you want to expand or reduce a number by 10 times or 100 times... you only need to move the decimal point. If there are not enough digits, use 0 to make up for it.
What is a composite number?
Meaning: In addition to 1 and itself, there are other factors. Such a number is called a composite number.
Total numbers within 20: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20.
The smallest sum is 4.
1 is neither a prime number nor a composite number.
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