John L. Lehet

  • XIPSafe

    FREE

    XIPSAFE is a subscription service available to students, faculty, and staff on college campuses that participate in our program. If you feel unsafe or there’s trouble, you can now alert campus security to your location at the touch a button! Find out how to put added safety in your own hands by...

  • Magic Puzzles

    $1.99

    Arrange numbers into the given pattern so numbers in red squares are the sum of adjacent squares and numbers in gray squares are the difference of the numbers in adjacent squares. Simple to understand, but not so simple to do! 42 puzzles in all - the further you go, the more challenging they...

  • Magic Puzzles Sampler

    (80)

    (1)


    FREE

    Arrange numbers into the given pattern so numbers in red squares are the sum of adjacent squares and numbers in gray squares are the difference of the numbers in adjacent squares. Simple to understand, but not so simple to do! This is a sampler of 7 puzzles that provide a great introduction to...

  • In A Word!

    $1.99

    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 Crosswords with the hooks of Scrabble. If you discover the solutions to 5 words quickly you may enter the In A Word Top Ten! If you like word...

  • In A Word! Lite!

    (16)

    (1)


    FREE

    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 Crosswords with the hooks of Scrabble. This is a free introductory version with 10 puzzles. If you like word play, you'll love In A Word!

  • Mental Math Flash

    (48)

    (2)


    FREE

    Mental Math Flash - Master basic Mental Math skills through quick paced flash card-like exercises. Master addition, subtraction, multiplication and division of single digit numbers. PLUS master complements (adding to 100), negative numbers, least common multiples and greatest common factors....

  • Mental Math - Multiplication

    $1.99

    Practice your mental Multiplication of 2-digit numbers. First practice and master multiplying 1-digit numbers by 2-digits numbers. Use this to them multiply pairs of 2-digit numbers. Learn and practice four methods including (1) the Addition Method; (2) the Subtraction Method; (3) the...

  • Mental Math Sampler

    (64)

    (3)


    FREE

    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 required for mastery. Mastery is considered 20 problems (mentally) in 60 seconds. With this sampler, you can master (1) adding 1-digit...

  • OcTangles 5

    FREE

    OcTangles 5 is a new sudoku-like puzzle comprised of rows and columns of octagons and squares. Each square is surrounded by four adjacent octagons. In addition, each square contains a number. This number is the sum of the numbers that need to be placed in the four adjacent octagons. In order...

  • Mental Math 3 - Add/Subtract

    $1.99

    Practice your mental Addition. Learn, practice and master new techniques to easily add and subtract 1-digit, 2-digit and 3-digit numbers. Learn and master complements and their use to make difficult addition(or subtraction) problems easy subtraction(or addition) problems. Finally learn how to...

  • Mental Math - Part 2

    $1.99

    Practice your mental multiplication. Learn, practice and master new techniques to easily multiply numbers by 11, multiply the numbers 1 to 20, square numbers that end in '5' and multiply numbers near 100. NO paper, pencil or calculator required. It all starts with mastering mental...

  • Kuruko Deluxe

    $1.99

    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 white and 24 blue. Each white hexagon is surrounded by 6 blue hexagons - 3 of which "point" to the white hexagon in the center. The...

  • Kuruko Sampler

    FREE

    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 white hexagon is surrounded by 6 blue hexagons - 3 of which "point" to the white hexagon in the center. The number in each white...

  • Mental Math - Part 1

    $1.99

    Mentally multiply and divide by 2,4,5,25 and 50! NO paper, pencil or calculator required. It all starts with mastering doubling and halving! That's it! Practice and master multiplying and dividing two-digit numbers by 2 ALL IN YOUR HEAD. You'll use this skill to then multiply and...

  • SAT Math Problem-a-Day Sampler

    (27)

    (18)


    FREE

    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 response to your answer. Subject and level filters facilitate practicing problems of your choice, for example Difficult Geometry problems. Subjects...

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