What is the sum of 402 and 308?

• A. 705
• B. 712
• C. 715
• D. 710

Answer: (D)

Adding numbers by lining up digits in each place value and carrying when a column sums to ten or more. For 402 and 308, start with the units: 2 + 8 = 10, write down 0 and carry 1. In the tens place, 0 + 0 + the carried 1 equals 1. In the hundreds place, 4 + 3 equals 7. Putting those results together gives 710. So the total is 710.