Brain Buster Addition and Subtraction

Difficulty: brainbuster

Anybody and everybody is welcome to take a quiz it's all free and open but only logged in users will have their results saved, receive detailed feedback and be able to participate in the leaderboards.

The most difficult addition and subtraction problems, take your time, keep the units lined up and read the questions carefully.

For example
Calculate 2 + -0.0122
So this is the same as saying 2.0000 - 0.0122
Which equals 1.9878