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Theory: Сложение двузначных чисел

Task

 Найти сумму:
 

\(\displaystyle +\) \(\displaystyle 6\) \(\displaystyle 2\)
  \(\displaystyle 5\)
 

 

Solution

1. Найдем сумму единиц числа \(\displaystyle 6\underline{2}\) (это число \(\displaystyle 2\)) с единицами числа \(\displaystyle \underline{5}\) (это само число \(\displaystyle 5\)):

\(\displaystyle 2+5=7{\small . }\)

\(\displaystyle +\) \(\displaystyle 6\) \(\displaystyle \color{red}{ 2}\)
  \(\displaystyle \color{red}{5}\)
  \(\displaystyle ?\) \(\displaystyle \color{red}{7}\)

 

2. Сносим десятки числа \(\displaystyle \underline{6}2\) (это число \(\displaystyle 6\)):

\(\displaystyle +\) \(\displaystyle \color{red}{6}\) \(\displaystyle 2\)
  \(\displaystyle 5\)
  \(\displaystyle \color{red}{6}\) \(\displaystyle 7\)

 

Таким образом,

\(\displaystyle +\) \(\displaystyle 6\) \(\displaystyle 2\)
  \(\displaystyle 5\)
  \(\displaystyle 6\) \(\displaystyle 7\)


Ответ: \(\displaystyle 67{\small . }\)