Question

Which is another way to check the sum of 104 + 34 + 228 + 877?

Answer 1

By adding 104+34 and then 228+877, Then adding both of the results and finally subtracting the answer by one of the factors.

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Explanation:

Which will be...

104+34=138

228+877=1,105

Then add them...

138+1,105=1,243

Finally, subtract your answer by one of the factors...

1,243-1,105

Which will result as 138. Which is also one of the factors you added earlier, that's basically what your looking fro when checking and subtraction and/or addition problem.