Задание
Перемножить числа:
| \(\displaystyle 7\) | \(\displaystyle 2\) | |||
| \(\displaystyle \times\) | ||||
| \(\displaystyle 3\) | \(\displaystyle 6\) | |||
| \(\displaystyle +\) | ||||
Решение
1. Умножаем единицы числа \(\displaystyle 3\underline{6} \) (это цифра \(\displaystyle 6\)) на число \(\displaystyle 72{\small:}\)
\(\displaystyle 6 \cdot 72=432\) (здесь также можно использовать умножение в столбик).
| \(\displaystyle \bf7\) | \(\displaystyle \bf2\) | |||
| \(\displaystyle \times\) | ||||
| \(\displaystyle 3\) | \(\displaystyle \bf6\) | |||
| \(\displaystyle \bf4\) | \(\displaystyle \bf3\) | \(\displaystyle \bf2\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | ||
| \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | |
2. Умножаем десятки числа \(\displaystyle \underline{3}6\) (это цифра \(\displaystyle 3\)) на число \(\displaystyle 72{\small:}\)
\(\displaystyle 3 \cdot 72=216{\small.} \)
| \(\displaystyle \bf7\) | \(\displaystyle \bf2\) | |||
| \(\displaystyle \times\) | ||||
| \(\displaystyle \bf3\) | \(\displaystyle 6\) | |||
| \(\displaystyle 4\) | \(\displaystyle 3\) | \(\displaystyle 2\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle \bf2\) | \(\displaystyle \bf1\) | \(\displaystyle \bf6\) | ||
| \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | \(\displaystyle ?\) | |
3. Складываем числа:
| \(\displaystyle 4\) | \(\displaystyle 3\) | \(\displaystyle 2\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle 2\) | \(\displaystyle 1\) | \(\displaystyle 6\) | ||
| \(\displaystyle \bf2\) | \(\displaystyle \bf5\) | \(\displaystyle \bf9\) | \(\displaystyle \bf2\) | |
В итоге мы получаем:
| \(\displaystyle 7\) | \(\displaystyle 2\) | |||
| \(\displaystyle \times\) | ||||
| \(\displaystyle 3\) | \(\displaystyle 6\) | |||
| \(\displaystyle 4\) | \(\displaystyle 3\) | \(\displaystyle 2\) | ||
| \(\displaystyle +\) | ||||
| \(\displaystyle 2\) | \(\displaystyle 1\) | \(\displaystyle 6\) | ||
| \(\displaystyle 2\) | \(\displaystyle 5\) | \(\displaystyle 9\) | \(\displaystyle 2\) | |
Ответ: \(\displaystyle 2592 {\small.}\)