(63 + x) + 29 = (63 + 29) + x = 92 + x

Вычисления:
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}63\\ 29\end{array}}\\ \begin{array}{r}\mathrm{92 }\end{array}\end{array}$

(a + 614) + 235 = (614 + 235) + a = 849 + a

Вычисления:
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}614\\ 235\end{array}}\\ \begin{array}{r}\mathrm{849 }\end{array}\end{array}$

y + 243 + 456 = (243 + 456) + y = 699 + y

Вычисления:
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}243\\ 456\end{array}}\\ \begin{array}{r}\mathrm{699 }\end{array}\end{array}$

2657 + p + 4292 = (2657 + 4292) + p = 6949 + p

Вычисления:
$\begin{array}{r}\begin{array}{r}+\end{array}\underline{\begin{array}{r}2657\\ 4292\end{array}}\\ \begin{array}{r}\mathrm{6949 }\end{array}\end{array}$