Задание
Найти сумму:
| \(\displaystyle +\) | \(\displaystyle 2\) | \(\displaystyle 3\) |
| \(\displaystyle 4\) | \(\displaystyle 5\) | |
Решение
1. Cкладываем единицы числа \(\displaystyle 2\underline{3}\) (это число \(\displaystyle 3\)) с единицами числа \(\displaystyle 4\underline{5}\) (это число \(\displaystyle 5\)): \(\displaystyle 3+5=8\).
| \(\displaystyle +\) | \(\displaystyle 2\) | \(\displaystyle \color{red} {3}\) |
| \(\displaystyle 4\) | \(\displaystyle \color{red} {5}\) | |
| \(\displaystyle ?\) | \(\displaystyle \color{red}{\bf 8}\) |
2. Cкладываем десятки числа \(\displaystyle \underline{2}3\) (это число \(\displaystyle 2\)) с десятками числа \(\displaystyle \underline{4}5\) (это число \(\displaystyle 4\)): \(\displaystyle 2+4=6\).
| \(\displaystyle +\) | \(\displaystyle \color{red} {2}\) | \(\displaystyle 3\) |
| \(\displaystyle \color{red} {4}\) | \(\displaystyle 5\) | |
| \(\displaystyle \color{red}{\bf 6}\) | \(\displaystyle 8\) |
Ответ: \(\displaystyle 68\).