Article: Determine which number is first in the problem and which is second. For example, in 5 + 3, the first number is 5 and the second number is 3. Put your finger there.   This is where you will start counting. For example if your math problem is 5 + 3, you should put your finger on 5 on your number line. You have now moved 1 space. If you start at 5, when you reach 6, you have moved 1 space. This will make sure you end on the answer to your problem.  Don't move more spaces than the second number in your addition problem. For example, if the second number in your problem is 3, you will move 3 spaces. That is the answer to your math problem. For example, if your math problem was 5 + 3, you would have moved 3 spaces to the right of 5. Your finger would be on 8 on your number line. 5 + 3 = 8. This will help you make sure you have the right answer to your math problem. If you come up with a different answer during your check, try again to double check.
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Look at your math problem. Find the first number of your addition problem on your number line. Move your finger to the right to the next hashmark and number. Move your finger the same number of spaces as the second number in your addition problem, then stop. Look to see what number your finger is on now. Try the method again to check your answer.