# How do you add 102309483975387532485839465034 and 7450460878932845347603847 ?

Jan 25, 2017

$102316834436266465331187068881$

#### Explanation:

Write the second number under the first and sum the columns from right to left, noting carried digits and including them in the sum of the next column as you go:

$102309483975387532485839465034$
$\underline{\textcolor{w h i t e}{00000} 7450460878932845347603847}$
$102316834436266465331187068881$
$\textcolor{w h i t e}{0000} \textcolor{g r e y}{1} \textcolor{w h i t e}{0} \textcolor{g r e y}{1} \textcolor{w h i t e}{0} \textcolor{g r e y}{11} \textcolor{w h i t e}{0} \textcolor{g r e y}{1111} \textcolor{w h i t e}{00} \textcolor{g r e y}{1111} \textcolor{w h i t e}{0} \textcolor{g r e y}{11} \textcolor{w h i t e}{0000} \textcolor{g r e y}{1}$

So:

• $4 + 7 = 11 \text{ } \textcolor{w h i t e}{00000}$ i.e. $1$ and carry $1$
• $3 + 4 + \textcolor{g r e y}{1} = 8$
• $0 + 8 = 8$
• etcetera