How do we solve vertical addition?
1) Write the numbers vertically one under the other in an organized way.
2) Mark + on the left side and draw a line to separate between the exercise and the results line.
3) Add the ones digit of the first number together with the ones digit of the second number and so on.
If we obtain a two-digit number - write the ones in the result and carry the to the next digit above.
\( \begin{aligned} &90 \\ +& \\ &~~9\\ &\underline{\phantom{776}} & \\ \end{aligned} \)
\( \begin{aligned} &12 \\ +& \\ &~~2 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
\( \begin{aligned} &31 \\ +& \\ &~~6 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
\( \begin{aligned} &40 \\ +& \\ &~~3 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
\( \begin{aligned} &44 \\ +& \\ &~~4 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
99
14
37
43
48
\( \begin{aligned} &57\\ +& \\ &~~2 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
\( \begin{aligned} &24 \\ +& \\ &~~4 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
\( \begin{aligned} &65 \\ +& \\ &~~4 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
\( \begin{aligned} &72 \\ +& \\ &~~7 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)\( \)
\( \begin{aligned} &81 \\ +& \\ &~~8 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
59
28
69
79
89
\( \begin{aligned} &92 \\ +& \\ &~~5\\ &\underline{\phantom{776}} & \\ \end{aligned} \)
\( \begin{aligned} &83 \\ +& \\ &~~6 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
\( \begin{aligned} &23 \\ +& \\ &~~7 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
\( \begin{aligned} &12 \\ +& \\ &~~8 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
\( \begin{aligned} &25 \\ +& \\ &~~6 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)
97
89
30
20
31