$1.(20)$ Convert the following numbers between different number systems. Clearly show your steps

for the data conversion.

$1).$ Evaluate the decimal equivalent for integer binary number: $101101102.$

$2).$ Convert the decimal number $145\mathrm{.}26$ to its equivalent binary form. $($Note: For the fraction part,

you just need to keep first $4$ digits.$)$

$3).$ Convert the binary number $110001111001000101011102$ to hexadecimal form.

$4).$ Convert decimal number $218910$ to hexadecimal form