Add Whole Numbers: example 1.18

Add: $43 + 69 .$

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

Add: $35 + 98 .$

How did it go?

Write the numbers so the digits line up vertically.	$\begin{matrix} 43 \\ \underset{____}{+ 69} \end{matrix}$
Add the digits in each place. Add the ones: $3 + 9 = 12$
Write the $2$ in the ones place in the sum. Add the $1$ ten to the tens place.	$\begin{matrix} \overset{1}{4} 3 \\ \underset{____}{+ 69} \\ 2 \end{matrix}$
Now add the tens: $1 + 4 + 6 = 11$ Write the 11 in the sum.	$\begin{matrix} \overset{1}{4} 3 \\ \underset{____}{+ 69} \\ 112 \end{matrix}$

Write the numbers so the digits line up vertically.	$\begin{matrix} 43 \\ \underset{____}{+ 69} \end{matrix}$
Add the digits in each place. Add the ones: $3 + 9 = 12$
Write the $2$ in the ones place in the sum. Add the $1$ ten to the tens place.	$\begin{matrix} \overset{1}{4} 3 \\ \underset{____}{+ 69} \\ 2 \end{matrix}$
Now add the tens: $1 + 4 + 6 = 11$ Write the 11 in the sum.	$\begin{matrix} \overset{1}{4} 3 \\ \underset{____}{+ 69} \\ 112 \end{matrix}$