Question

What number added to 3.56 gives 23.018?

Answer 1

Let the required number be x.

According to the question,
3.56 + x = 23.018
⇒ x = 23.018 − 3.56

$$\begin{gathered} \stackrel{1}{\cancel{2}}\stackrel{12}{\cancel{3}}.\stackrel{9}{\cancel{0}}\stackrel{11}{\cancel{1}}8 \\ \underline{-3.560} \\ \underline{19.458} \end{gathered}$$

⇒ x = 19.458

Hence, 19.458 when ​added to 3.56 gives 23.018.