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Computation Algorithms: Addition
 
Objective #4:Three-digit addend plus three-digit addend.

Example

Follow these steps to solve this problem:

  1. Add the hundreds (600+900).
  2. Write 1500.
  3. Add the tens (20+50).
  4. Write 70.
  5. Add the ones (4+1).
  6. Write 5.
  7. Add the partial sums (1500+70+5).
  8. Write 1575.
Directions: Enter the answer for each addition problem. Press tab or use the mouse to move to the next problem. When you are finished click the submit button.

1.

484
+399


2.

426
+726


3.

382
+853

           

4.

884
+252


5.

713
+983


6.

245
+455

           

7.

457
+694


8.

394
+291


9.

793
+975

           

10.

282
+541


11.

339
+566


12.

447
+985

           

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