Question

How do you add `102309483975387532485839465034` and `7450460878932845347603847` ?

Answer 1

`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(color(white)(00000)7450460878932845347603847)`
`102316834436266465331187068881`
`color(white)(0000)color(grey)(1)color(white)(0)color(grey)(1)color(white)(0)color(grey)(11)color(white)(0)color(grey)(1111)color(white)(00)color(grey)(1111)color(white)(0)color(grey)(11)color(white)(0000)color(grey)(1)`

So:

• `4+7 = 11" "color(white)(00000)` i.e. `1` and carry `1`
• `3+4+color(grey)(1) = 8`
• `0+8=8`
• etcetera