Tick Tock Subtraction LITE is made to help you practice and sharpen your subtracting skills - learn how to subtract in a flash! Nice! Think you're good with numbers? Then how about 483 - 274? Now try to do as many equations like that in a 50 second pressure shot-clock? Still think it's easy? Become a maths whiz and try to better your score! Don't like being under pressure while you do your maths? Use the Practice Zone and choose the level you feel is right for you.