John L. Lehet

A Sampler of 25 Archived Problems and 2 Archived Exams for the SAT Math problem a day - Each problem has a hint, detailed solution and immediate respo …

XIPSAFE is a subscription service available to students, faculty, and staff on college campuses that participate in our program. If you feel unsafe or …

This is a Kuruko Deluxe with unlimited puzzles in three levels of difficulty! Kuruko Puzzles are a new sudoku-like puzzle comprised of 31 hexagons, 7 …

This is a Kuruko Puzzle Sampler with ten free puzzles! Kuruko Puzzles are a new sudoku-like puzzle comprised of 31 hexagons, 7 white and 24 blue. Each …

Can you discover 5 words? With only a short clue for each and a 3-letter word that each contains? That's In A Word! Combining the cryptic clues of …

Practice your mental multiplication. Learn, practice and master new techniques to easily multiply numbers by 11, multiply the numbers 1 to 20, square …

New SAT Math problem daily and archive of problems! Multiple question timed tests (10 questions in 5 minutes) with test archive. Perfect SAT Preparati …

Can you discover 5 words? With only a short clue for each and a 3-letter word that each contains? That's In A Word! Combining the cryptic clues of …

Master some basic mental math skills and tricks. It's all about practice and mastery. The skills are easy to learn and understand, but practice is …

Mental Math Flash - Master basic Mental Math skills through quick paced flash card-like exercises. Master addition, subtraction, multiplication and di …