Grade 3 Addition: 3-Digit Addition

Worked examples

Real problems from the practice worksheets, solved one step at a time.

1. Example 1

   673 + 113 = ?

   1. Line up the numbers by place value.
   2. Add each column from right to left.
   3. Ones: 3 + 3 = 6
   4. Tens: 7 + 1 = 8
   5. Hundreds: 6 + 1 = 7
   6. The answer is 786.

   Answer: 786

2. Example 2

   511 + 142 = ?

   1. Line up the numbers by place value.
   2. Add each column from right to left.
   3. Ones: 1 + 2 = 3
   4. Tens: 1 + 4 = 5
   5. Hundreds: 5 + 1 = 6
   6. The answer is 653.

   Answer: 653

3. Example 3

   218 + 280 = ?

   1. Line up the numbers by place value.
   2. Add each column from right to left.
   3. Ones: 8 + 0 = 8
   4. Tens: 1 + 8 = 9
   5. Hundreds: 2 + 2 = 4
   6. The answer is 498.

   Answer: 498