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Computation Algorithms: Addition
 
Objective #2:Two-digit addend plus two-digit addend.

Example

Follow these steps to solve this problem:

  1. Add the tens (40+80).
  2. Write 120.
  3. Add the ones (8+1).
  4. Write 9.
  5. Add the partial sums (120+9).
  6. Write 129.
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.

25
+65


2.

12
+67


3.

17
+37

           

4.

58
+54


5.

24
+48


6.

74
+96

           

7.

27
+74


8.

78
+41


9.

13
+67

           

10.

69
+18


11.

16
+45


12.

48
+33

           

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