Click number buttons for multiplication tables (1-1000), use Prime/Square/Cube/Fibonacci/Even/Odd, pick a larger table, or pick a number to see its factor pairs (each pair gets its own color). Hover a highlighted square or cube to see its base number.
Count the blocks, then type the number and check your answer.
Count both groups, then pick <, =, or > to compare them.
Work through Levels 1-5 (20 numbers each, 1-100) -- view every number in a level, then take that level's quiz to unlock the next. Levels 6-8 are quiz-only.
Practice Quiz
Pick one or more question types, then how many questions you want.