Write this number in BINARY. 9 1001 1011 1100 1010

The correct answer is 1001.<br /><br />To convert the decimal number 9 to binary, we can repeatedly divide it by 2 and record the remainders in reverse order:<br /><br />9 ÷ 2 = 4 remainder 1<br />4 ÷ 2 = 2 remainder 0<br />2 ÷ 2 = 1 remainder 0<br />1 ÷ 2 = 0 remainder 1<br /><br />Reading the remainders in reverse order, we get the binary representation of 9 as 1001.