3.5=7/2=3 1/2

7.4=37/5=7 2/5

4. 125=33/8=4 1/8

The specific method is:

Decimal part to decimal part, the original number multiplied by 10 as the numerator and 10 as the denominator, which can be divided into bidding points;

From the decimal part to the percentile, the original number is multiplied by 100 as the numerator and 100 as the denominator, which can be simplified to offer points;

If the decimal part reaches one thousandth, the original number is multiplied by 1000 as the numerator and 1000 as the denominator, which can be divided into bidding points;

And so on.

Become a band soundtrack:

(vertical calculation, integer division, don't add 0 after the remainder, except the number)

When the numerator is divided by the denominator, it stops at one place, and decimal division is carried out without adding zero. At this point, the incomplete quotient is an integer part with a fraction, the divisor is the denominator of the fraction part (note that it is not a numerator), the remainder is the numerator of the fraction part, and the fraction part can be reduced by a quotation.