crewmath. aims to help you improve your mental dead reckoning skills by simplifying the process for you to generate questions and check answers, without the need to write out different questions which can take away hours from your practice.

crewmath. helps you to practice:
-Reciprocals
-Product
-Fractions
-Ratios
-Non-Integer Multiplication
-Non-Integer Division

Give it a try today and see what difference it makes to your study schedule!