Suma en vertical: Suma simple de números de 2 dígitos y 1 dígito

$\begin{aligned} &12 \\ +& \\ &~~2 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

14

$\begin{aligned} &24 \\ +& \\ &~~4 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

28

$\begin{aligned} &31 \\ +& \\ &~~6 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

37

$\begin{aligned} &40 \\ +& \\ &~~3 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

43

$\begin{aligned} &44 \\ +& \\ &~~4 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

48

$\begin{aligned} &57\\ +& \\ &~~2 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

59

$\begin{aligned} &65 \\ +& \\ &~~4 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

69

$\begin{aligned} &72 \\ +& \\ &~~7 \\ &\underline{\phantom{776}} & \\ \end{aligned}$$$

79

$\begin{aligned} &81 \\ +& \\ &~~8 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

89

$\begin{aligned} &83 \\ +& \\ &~~6 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

89

$\begin{aligned} &90 \\ +& \\ &~~9\\ &\underline{\phantom{776}} & \\ \end{aligned}$

99

$\begin{aligned} &92 \\ +& \\ &~~5\\ &\underline{\phantom{776}} & \\ \end{aligned}$

97