Vertical Addition: Addition of 3-digit numbers with the regrouping of tens and hundreds

$\begin{aligned} &115 \\ +& \\ &236 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

351

$\begin{aligned} &376 \\ +& \\ &214 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

590

$\begin{aligned} &137 \\ +& \\ &523 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

660

$\begin{aligned} &453 \\ +& \\ &152 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

605

$\begin{aligned} &228 \\ +& \\ &512 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

740

$\begin{aligned} &274 \\ +& \\ &519 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

793

$\begin{aligned} &574 \\ +& \\ &333 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

907

$\begin{aligned} &614 \\ +& \\ &290 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

904