Grade 3 Addition: Mixed Multi-digit Addition

Worked examples

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

1. Example 1

   51 + 561 = ?

   1. Line up the numbers by place value.
   2. Add each column from right to left.
   3. Ones: 1 + 1 = 2
   4. Tens: 5 + 6 = 11. Write 1, carry 1.
   5. Hundreds: 0 + 5 + 1 (carried) = 6
   6. The answer is 612.

   Answer: 612

2. Example 2

   730 + 26 = ?

   1. Line up the numbers by place value.
   2. Add each column from right to left.
   3. Ones: 0 + 6 = 6
   4. Tens: 3 + 2 = 5
   5. Hundreds: 7 + 0 = 7
   6. The answer is 756.

   Answer: 756

3. Example 3

   878 + 83 = ?

   1. Line up the numbers by place value.
   2. Add each column from right to left.
   3. Ones: 8 + 3 = 11. Write 1, carry 1.
   4. Tens: 7 + 8 + 1 (carried) = 16. Write 6, carry 1.
   5. Hundreds: 8 + 0 + 1 (carried) = 9
   6. The answer is 961.

   Answer: 961