Question

I solved this problem : 33 + 45 + 78 how could i check my answer?​

Answer 1

you can check the answer by: adding the numbers together, then add only 2 of the numbers together and subtract the sum of the 2 numbers that you added, from the sum of all of the numbers. for the answer, you should get the number that you left out.

i hope this helped! :)

Answer 2

Explanation:

So the answer for 33+45+78 is 156.

If you want to check that, you can use inverse operations, so subtract.

156-78=78. (Check 78)

78-45=33 (Check 45 and 33)

Well, now it's checked because we used all the factors of the equation!