The question does not indicate what base 1001 is in and therefore cannot be answered.
However if you mean in the context of binary, It is actually 9.
1001 in binary is equal to 9 in decimal.
1001 base 2 = 9 base 10
In HEX, 1101 1001 is D9. Translated to decimal, that equals 217.
1101 1001 in binary is D9 in hex and 139 in decimal
In Binary-Coded Decimal (BCD), each decimal digit is represented by its own four-bit binary equivalent. Since the highest decimal digit is 9, the highest number in BCD corresponds to the decimal number 9, which is represented in BCD as 1001. Thus, the highest BCD representation for a single digit is 1001. For multiple digits, the highest number would be 999, represented in BCD as 1001 1001 1001.
110010010001 is 3217 in decimal.
The binary number 11011001 relates in decimal to the number 221.
After 1001 comes 1002. In the decimal number system, each number is followed by the next consecutive number, which increases by 1. So, after 1001, the next number in the sequence is 1002.
1001 0111 base 2
To multiply the binary numbers 1011 (which is 11 in decimal) and 1001 (which is 9 in decimal), we perform binary multiplication similar to decimal multiplication. The steps involve shifting and adding based on the bits of the second number: 1011 0000 (this is 1011 shifted left by 0, as the last digit of 1001 is 1) 1011 (this is 1011 shifted left by 1, as the second digit of 1001 is 0, so we add nothing) 0000 (this is 1011 shifted left by 2, as the third digit of 1001 is 0, so we add nothing) 1011 (this is 1011 shifted left by 3, as the first digit of 1001 is 1) Adding these together gives us 10011111 in binary. Therefore, the product of 1011 and 1001 is 10011111, which is 99 in decimal.
The largest number that can be represented in Binary-Coded Decimal (BCD) is 9,999, which corresponds to the BCD representation of 1001 1000 1001 1001. Each decimal digit is individually encoded in four bits, allowing BCD to represent decimal numbers up to 9 for each digit. Thus, for a four-digit BCD representation, the maximum is 9,999.
00001001 can be written as 0000 1001 which is hex 09 and hence has a decimal value of 9