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Theory: Вычитание трехзначных чисел

Task

Найти разность: 

\(\displaystyle -\) \(\displaystyle 3\) \(\displaystyle 4\) \(\displaystyle 2\)
\(\displaystyle 1\) \(\displaystyle 3\) \(\displaystyle 1\)
 

 

Solution

1. Из единиц числа \(\displaystyle 34\underline{2} \) (это число \(\displaystyle 2 \)) вычитаем единицы числа \(\displaystyle 13\underline{1}\) (это число \(\displaystyle 1\)):

\(\displaystyle 2-1=1.\)

\(\displaystyle -\) \(\displaystyle 3\) \(\displaystyle 4\) \(\displaystyle \color{red}{2}\)
\(\displaystyle 1\) \(\displaystyle 3\) \(\displaystyle \color{red}{1}\)
  \(\displaystyle ?\) \(\displaystyle ?\) \(\displaystyle \color{red}{\bf1}\)

 

2. Вычитаем из десятков числа \(\displaystyle 3\underline{4}2\) (это число \(\displaystyle 4\)) десятки числа \(\displaystyle 1\underline{3}1\) (это число \(\displaystyle 3\)):

\(\displaystyle 4-3=1.\)

\(\displaystyle -\) \(\displaystyle 3\) \(\displaystyle \color{red}{4}\) \(\displaystyle 2\)
\(\displaystyle 1\) \(\displaystyle \color{red}{3}\) \(\displaystyle 1\)
  \(\displaystyle ?\) \(\displaystyle \color{red}{\bf1}\) \(\displaystyle 1\)

 

3. Вычитаем из сотен числа \(\displaystyle \underline{3}42 \) (это число \(\displaystyle 3\)) сотни числа \(\displaystyle \underline{1}31\) (это число \(\displaystyle 1\)):

\(\displaystyle 3-1=2.\)

\(\displaystyle -\) \(\displaystyle \color{red}{3}\) \(\displaystyle 4\) \(\displaystyle 2\)
\(\displaystyle \color{red}{1}\) \(\displaystyle 3\) \(\displaystyle 1\)
  \(\displaystyle \color{red}{\bf2}\) \(\displaystyle 1\) \(\displaystyle 1\)


Ответ: \(\displaystyle 211.\)