Read the question

Solve the following addition problem.

Addition using doubles
The question content

Then answer and click the Submit button to send the answer and view the results.

In case of an incorrect answer

Addition using doubles - answer incorrect
The answer result

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Then click the Solution To view instructions on how to answer correctly.

Addition using doubles - solution 1
Step 1
Addition using doubles - solution 2
Step 2
Addition using doubles - solution 3
Step 3

In case of a correct answer

Addition using doubles - answer correct
Correct result

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and then press the Next to continue answering the next question.