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Теория: Умножение двузначных чисел

Задание

Перемножить числа:

 \(\displaystyle \times\)\(\displaystyle 2\)\(\displaystyle 3\)
 \(\displaystyle 3\)\(\displaystyle 2\)
\(\displaystyle +\) 
 
 

 

Решение

1. Умножаем единицы числа \(\displaystyle 3\underline{2} \) (это цифра \(\displaystyle 2 \)) на число \(\displaystyle 23 {\small : }\)

 

\(\displaystyle 2 \cdot 23=46 {\small . }\)

 

 \(\displaystyle \times\)\(\displaystyle \bf2\)\(\displaystyle \bf3\)
 \(\displaystyle 3\)\(\displaystyle \bf2\)
\(\displaystyle +\) \(\displaystyle \bf4\)\(\displaystyle \bf6\)
\(\displaystyle ?\)\(\displaystyle ?\)  
 \(\displaystyle ?\)\(\displaystyle ?\)\(\displaystyle ?\)

 

2. Умножаем десятки числа \(\displaystyle \underline{3}2 \) (это цифра \(\displaystyle 3 \)) на число \(\displaystyle 23 {\small : }\)

 

\(\displaystyle 3 \cdot 23=69 {\small . } \)

 

 \(\displaystyle \times\)\(\displaystyle \bf2\)\(\displaystyle \bf3\)
 \(\displaystyle \bf3\)\(\displaystyle 2\)
\(\displaystyle +\) \(\displaystyle 4\)\(\displaystyle 6\)
\(\displaystyle \bf6\)\(\displaystyle \bf9\) 
 \(\displaystyle ?\)\(\displaystyle ?\)\(\displaystyle ?\)

 

3. Складываем числа:

\(\displaystyle +\) \(\displaystyle 4\)\(\displaystyle 6\)
\(\displaystyle 6\)\(\displaystyle 9\)  
 \(\displaystyle 7\)\(\displaystyle 3\)\(\displaystyle 6\)

 

В итоге мы получаем:

 \(\displaystyle \times\)\(\displaystyle 2\)\(\displaystyle 3\)
 \(\displaystyle 3\)\(\displaystyle 2\)
\(\displaystyle +\) \(\displaystyle 4\)\(\displaystyle 6\)
\(\displaystyle 6\)\(\displaystyle 9\)  
 \(\displaystyle 7\)\(\displaystyle 3\)\(\displaystyle 6\)

Ответ: \(\displaystyle 736 {\small . }\)