Chapter 1, Problem 1IR

To determine

Perform indicated operation

  $\begin{array}{l}42\\ \text{ 63}\\ \underset{\_}{+89}\end{array}$

Answer to Problem 1IR

194

Explanation of Solution

Given:

  $\begin{array}{l}42\\ \text{ 63}\\ \underset{\_}{+89}\end{array}$

Concept Used:

• Rule of addition of whole numbers: to add whole numbers, we add the digits in the ones place, then the tens, then the hundreds place, and so on. And when the sum of digits in corresponding place values is more then 9, carrying is necessary.

Calculation:

To evaluate $\begin{array}{l}42\\ \text{ 63}\\ \underset{\_}{+89}\end{array}$

As the indicated operation is addition thus, we use rule of addition of whole numbers: to add whole numbers, we add the digits in the ones place, then in tens place, then the hundreds place, and so on

As the sum of digits in unit place $\left(2+3+9=14\right)$ is greater than 9 thus carrying is necessary

Thus,

  $\begin{array}{l}\stackrel{1}{4}2\\ \text{ 63}\\ \underset{\_}{+89}\\ \text{ 19}4\end{array}$