Mental Math

Addition of 2 numbers (up to 3 digits long). You pick the range of random numbers displayed. 16 Random numbers are displayed, one with the correct choice. Subtraction of 2 numbers (up to 3 digits long). You pick the range of random numbers displayed. 16 Random numbers are displayed, one with the correct choice. Multiplication of 2 numbers (up to 3 digits long). You pick the range of random numbers displayed. 16 Random numbers are displayed, one with the correct choice. Division of 2 numbers (up to 3 digits long). You pick the range of random numbers displayed. 16 Random numbers are displayed, one with the correct choice. Please do all work mentally. Next update will include a manual entry of a number for a try at the correct answer. This will show by how many digits of the correct answer you came close to. Please make sure you can handle the range of numbers you specified.