Multiply the decimal part by 16 to get the product, then take out the integer bit, multiply the decimal part by 16, and loop until the decimal place is 0, or get the decimal precision you think is appropriate. Then connect the extracted integers, that is, the hexadecimal decimal to be converted.

Extended data:

Convert a hexadecimal number into a decimal number.

Binary, using two Arabic numerals: 0,1;

Octal, with eight Arabic numerals: 0, 1, 2, 3, 4, 5, 6, 7;

10 decimal, ten Arabic numerals: 0 to 9;

16, sixteen Arabic numerals ... Wait, the Indians only invented 10?

The cardinal number of 16 is from 16 to 1, but we only have ten numbers from 0 to 9, so we use the letters a, b, c, d, e and f to represent 10,1and/respectively. Letters are case-insensitive.