#### Answer

$14,399

#### Work Step by Step

$6871$ + $7528$
Start at the right of each number and add the ones digits
$1$ + $8$ = $9$ ones
Write the 9 one in the ones column.
Add the tens digits next.
$7 + 2 = 9$
Write the 9 tens in the tens column
Add the hundreds digits next.
$8 + 5 = 13$ hundreds
Regroup $13$ hundreds as 1 thousand and 3 hundreds
Write the 3 hundreds in the hundreds column. Write the 1 thousand in the thousands column.
Add the thousands digits next including the regrouped 1.
$1 + 6 + 7= 14$. Regroup the 14 thousands as 1 ten-thousand and 4 thousands. Write the 4 thousand in the thousands column. Write the 1 in the ten-thousand column.
Separate each group of three digits with a comma.
The sum of the two numbers is $14,399$