#### Answer

$11,624$

#### Work Step by Step

$7896$ + $3728$
Start at the right of each number
Add the ones digits
$6$ + $8$ = $14$ ones
Regroup 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 digits next including the regrouped 1.
$1$+ $9$ +$2$ = $12$ tens
Regroup the 12 tens as 1 hundred and 2 tens
Write the 2 tens in the tens column.
Write the 1 hundred in the hundreds column.
Add the hundreds digits next including the regrouped 1.
$1$ +$8$+ $7$=$16$ hundreds
Regroup 16 hundreds as 1 thousand and 6 hundreds
Write the 6 hundreds in the hundreds column.
Write the 1 thousand in the thousands column.
Add the thousands digits next including the regrouped 1.
$1$+$7$+$3$=$11$ thousands.
Regroup the 11 thousands as 1 ten-thousand and 1 thousand.
Write the 1 thousand in the thousands column.
Write the 1 ten-thousand in the ten-thousand column.
Add the ten-thousands digits next which is the regrouped 1.
1 ten-thousand
Separate each group of three digits with a comma.
The sum of the two numbers is $11,624$.