Chapter 1 - Whole Numbers - 1.2 Adding Whole Numbers - 1.2 Exercises - Page 18: 9

$7785$

$6310 + 252 + 1223$ Start at the right of each number and add the ones digits $0 + 2 + 3 = 5$ ones Write the 5 ones in the ones column. Add the tens digits next. $1 + 5 + 2 = 8$ tens Write the 8 tens in the tens column. Add the hundreds column next $3 + 2 + 2 = 7$ hundreds Write the 7 hundreds in the hundreds column Add the thousands digits next. $6 + 1 = 7$ thousands Write the 7 thousands in the thousands column. The sum of the three numbers is $7785$