Question

Solve mentally$.$

$200,000-128$

Answer 1

Given numerical expression is $200,000-128$

For subtraction use the following steps$.$

• Change the first digit of minuend with its predecessor
• Replace every zero of minuend from left with $9$ and the last with $10$
• Subtract the number

$$\begin{gathered} 200000 \\ \underbrace{|}\underbrace{|}\underbrace{|}\underbrace{|}\underbrace{|} \\ 1999910 \end{gathered}$$

Now subtract

$$\begin{gathered} 1999910 \\ -128 \\ \overline{199872} \end{gathered}$$

Hence$,$ the value of $200,000-128$ is $199872$