## Basic College Mathematics (9th Edition)

$413$
$278 + 135$ Start at the right of each number and add the ones digits $8 + 5 = 13$ ones Regroup the $13$ ones as $1$ ten and $3$ ones Write the $3$ ones in the ones column. Write the $1$ ten in the tens column. Add the tens digits next including the regrouped $1$. $1 + 7 + 3 = 11$ tens Regroup the $11$ tens as $1$ hundred and $1$ ten Write the $1$ ten in the tens column. Write the $1$ hundred in the hundreds column Add the hundreds column next including the regrouped 1 $1 + 2 + 1 = 4$ hundreds Write the $4$ hundreds in the hundreds column The sum of the two numbers is $413$