#### Answer

$15,594$

#### Work Step by Step

$422 + 6074 + 435 + 8663$
Start at the right of each number and add the ones digits
$2 + 4 + 5 + 3 = 14$ ones
Regroup the $14$ ones as $1$ ten and $4$ ones
Write the $4$ ones in the ones column.
Write the $1$ ten in the tens column
Add the tens column next including the regrouped $1$
$1 + 2 + 7 +3 + 6 = 19$ tens
Regroup the $19$ tens as $1$ hundred and $9$ tens
Write the $9$ tens in the tens column.
Write the $1$ hundred in the hundreds column
Add the hundreds column next including the regrouped $1$
$1 + 4 + 0 + 4 + 6 = 15$ hundreds
Regroup the $15$ hundreds as $1$ thousand and $5$ hundreds
Write the $5$ hundreds in the hundreds column
Write the $1$ thousand in the thousands column
Add the thousands column next including the regrouped $1$
$1 + 6 + 8 = 15$ thousands
Regroup the $15$ thousands as $1$ ten-thousand and $5$ thousands
Write the $5$ in the thousands column.
Write the $1$ in the ten-thousands column
Add the ten-thousands column next which is the regrouped $1$
Write the $1$ in the ten-thousands column.
$15594$
Separate each group of three digits with a comma.
$15,594$