Math problem in the fourth grade of primary school: after the decimal point of a certain number is moved one place to the left, it is less than the original number 18. What is the original number? - Training Enrollment Network

Math problem in the fourth grade of primary school: after the decimal point of a certain number is moved one place to the left, it is less than the original number 18. What is the original number?

Moving the decimal point of a number one place to the left is to restore it to the original110.

Because it is smaller than the original number 18, the difference between 18 is the original number (1

-

110), which is 9/ 10 of the original number, so,

Original number: 18.

/

(9/ 10)=

18

*

( 10/9)=

20

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