Chapter 1 - Whole Numbers - 1.2 Adding Whole Numbers - 1.2 Exercises - Page 18: 36

$328$

$172 + 156$ Start at the right of each number and add the ones digits $2 + 6 = 8$ ones Write the $8$ ones in the ones column. Add the tens column next $7 + 5 = 12$ 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 column next including the regrouped 1 $1 + 1 + 1 = 3$ hundreds Write the $3$ hundreds in the hundreds column The sum of the two numbers is $328$