First, the law of quotient invariance
In division, the divisor and divisor expand or shrink by the same multiple at the same time, and the quotient remains unchanged.
Second, the nature of decimals
Add zero or delete zero after the decimal point. The size of the decimal remains the same.
Thirdly, the movement of decimal position causes the change of decimal size.
1. If the decimal point moves one place to the right, the original number will be expanded by 10 times; If the decimal point is moved two places to the right, the original number will be expanded by 100 times; If the decimal point is moved three places to the right, the original number will be enlarged by 1000 times. ...
2. If the decimal point moves one place to the left, the original number will be reduced by 10 times; If the decimal point is moved two places to the left, the original number will be reduced by 100 times; If the decimal point is moved three places to the left, the original number will be reduced by 1000 times. ...
3. When the decimal point is not moved to the left or right, use "0" to make up the digits.
Fourth, the basic nature of the score
The numerator and denominator of a fraction are multiplied or divided by the same number (except zero), and the size of the fraction remains the same.
The relationship between verb (verb's abbreviation) score and division
1. divider/divider = divider/divider
2. Because zero can't be divisible, the denominator of the fraction can't be zero.
3. Divider is equivalent to numerator and divisor is equivalent to denominator.