Mental Math Challenge

Write your own problem: enter values in the box to the left of each variable.
Be sure to choose values that challenge your skills. PLEASE, no calculators !
Complete the calculation and enter your answer for x. (Use decimal equivalents for fractions.) and "Check it!"

1) = a = b a + b = my answer	6) = a = b a - b = my answer
2) = a = b a * b = my answer	7) = a = b a / b = my answer
3) = c c incremented by 1 or c becomes c + 1 , written c = c + 1 or c + + = my answer	8) = b b decremented by 1 or b becomes b - 1 , written b = b - 1 or b - - = my answer
4) = a = b = c a * b + c = my answer	9) = a = b = c a / b - c = my answer
5) = a = b 2a + b = my answer	10) = a - a = my answer
To clear all answers and start again: hold down SHIFT and click "Reload"(Netscape) or "Refresh"(Internet Explorer).