Question

What decimals fraction should be added to $34.21$ to get the sum as $78.1$?

Answer 1

Let the required decimal fraction be $X$.

According to question

$34.21+X=78.1$

Transfer $34.21$ to the right hand side. we have,

$$\begin{gathered} X=78.1-34.2178.10-34.2143.89 \\ =43.89 \end{gathered}$$

Hence $43.89$ is added to $34.21$ to get the sum as $78.1$.