The operation below was carried out in base 2. Find the missing number.$\begin{align}  & **** \\ & +111 \\ & \underline{\text{  }110} \\ & \underline{10110} \\\end{align}$

Convert 553₇ to a number base 10

If ${{x}_{10}}={{23}_{5}}$ find x

If ${{110001}_{2}}-{{x}_{10}}={{10101}_{2}}$ find x

Simplify ${{23}_{4}}\times {{22}_{4}}$

Find the value of 110111₂ + 10100₂

$\text{Convert 2}{{\text{7}}_{10}}\text{ to another number in base three}$

Convert 72₆ to a number in base three