Задание
Перемножить числа:
| \(\displaystyle 7\) | \(\displaystyle 6\) | |||
| \(\displaystyle \times\) | ||||
| \(\displaystyle 6\) | \(\displaystyle 9\) | |||
| \(\displaystyle +\) | ||||
Решение
1. Умножаем единицы числа \(\displaystyle 6\underline{9} \) (это число \(\displaystyle 9\)) на число \(\displaystyle 76{\small:}\)
\(\displaystyle 9 \cdot 76=684\) (здесь также можно использовать умножение в столбик).
| \(\displaystyle \bf7\) | \(\displaystyle \bf6\) | |||
| \(\displaystyle \times\) | ||||
| \(\displaystyle 6\) | \(\displaystyle \bf9\) | |||
| \(\displaystyle \bf6\) | \(\displaystyle \bf8\) | \(\displaystyle \bf4\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | ||
| \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | |
2. Умножаем десятки числа \(\displaystyle \underline{6}9\) (это цифра \(\displaystyle 6 \)) на число \(\displaystyle 76{\small:}\)
\(\displaystyle 6 \cdot 76=456 {\small.}\)
| \(\displaystyle \bf7\) | \(\displaystyle \bf6\) | |||
| \(\displaystyle \times\) | ||||
| \(\displaystyle \bf6\) | \(\displaystyle 9\) | |||
| \(\displaystyle 6\) | \(\displaystyle 8\) | \(\displaystyle 4\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle \bf4\) | \(\displaystyle \bf5\) | \(\displaystyle \bf6\) | ||
| \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | |
Складываем числа:
| \(\displaystyle 6\) | \(\displaystyle 8\) | \(\displaystyle 4\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle 4\) | \(\displaystyle 5\) | \(\displaystyle 6\) | ||
| \(\displaystyle \bf5\) | \(\displaystyle \bf2\) | \(\displaystyle \bf4\) | \(\displaystyle \bf4\) | |
В итоге мы получаем:
| \(\displaystyle 7\) | \(\displaystyle 6\) | |||
| \(\displaystyle \times\) | ||||
| \(\displaystyle 6\) | \(\displaystyle 9\) | |||
| \(\displaystyle 6\) | \(\displaystyle 8\) | \(\displaystyle 4\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle 4\) | \(\displaystyle 5\) | \(\displaystyle 6\) | ||
| \(\displaystyle 5\) | \(\displaystyle 2\) | \(\displaystyle 4\) | \(\displaystyle 4\) | |
Ответ: \(\displaystyle 5244{\small.} \)