Question

Solve mentally$.$

$10,00,000-7,39,145$

Answer 1

Given numerical expression is $10,00,000-7,39,145$

Replace every zero from the left with $9$ and the last zero with a $10$

$$\begin{gathered} 1000000 \\ \underbrace{|}\underbrace{|}\underbrace{|}\underbrace{|}\underbrace{|}\underbrace{|} \\ 9999910 \end{gathered}$$

Now subtract each digit from $9$ and last digit from $10$

$$\begin{gathered} 9999910 \\ -739145 \\ \overline{260855} \end{gathered}$$

Hence$,$ the value of $10,00,000-7,39,145$ is $260855$