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Теория: Сложение трехзначных чисел

Задание

Найти сумму: 

\(\displaystyle +\) \(\displaystyle 1\) \(\displaystyle 1\) \(\displaystyle 3\)
\(\displaystyle 1\) \(\displaystyle 3\) \(\displaystyle 5\)
 

 

Решение

1. Складываем единицы: \(\displaystyle 3+5=8.\)

\(\displaystyle +\) \(\displaystyle 1\) \(\displaystyle 1\) \(\displaystyle \color{red}{3}\)
\(\displaystyle 1\) \(\displaystyle 3\) \(\displaystyle \color{red}{5}\)
  \(\displaystyle ?\) \(\displaystyle ?\) \(\displaystyle \color{red}{\bf8}\)

 

2. Складываем десятки: \(\displaystyle 1+3=4.\)

\(\displaystyle +\) \(\displaystyle 1\) \(\displaystyle \color{red}{1}\) \(\displaystyle 3\)
\(\displaystyle 1\) \(\displaystyle \color{red}{3}\) \(\displaystyle 5\)
  \(\displaystyle ?\) \(\displaystyle \color{red}{\bf4}\) \(\displaystyle 8\)

 

3. Складываем сотни: \(\displaystyle 1+1=2.\)

\(\displaystyle +\) \(\displaystyle \color{red}{1}\) \(\displaystyle 1\) \(\displaystyle 3\)
\(\displaystyle \color{red}{1}\) \(\displaystyle 3\) \(\displaystyle 5\)
  \(\displaystyle \color{red}{\bf2}\) \(\displaystyle 4\) \(\displaystyle 8\)

 

Ответ: \(\displaystyle 113+135=248.\)