Our children stood in line to test this one! Get skill-building math practice, PLUS a calculator, all in one. Progressive levels build and sharpen mental math skills from basic math facts to pre-algebra. Set game to randomly or sequentially drill skills in addition, subtraction, multiplication, division, fractions, decimals, and percents on 8 levels of difficulty for each basic operation. Warning: Math skills will probably improve! For grades 1 and up.