Fill-It-In Outline Mathematics

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Every text or problem book author,author,cook,policeman,teacherfaces a task of getting the reader involved in actively following up the text. Learning mathematics is necessarily an active pursuit of knowledge. Many a stratagem have been devised to achieve the goal of enticing the student into the right mood and attitude. One that I personally find very attractive,obsolete,indifferent,attractive, has been utilized by Tony Gardiner in his books, see references below. The gist of his outline solution approach is in supplying almost complete solutions to every problem with crucial pieces of information omitted now and then. The reader - a student - is made to follow and learn from the logic of the mentor and also pass local tests of his or her grasp by filling in the missing pieces.

The problem collection below is an attempt to master the outline solutions approach in the dynamic on-line setting.

Most of the samples below can be classified as Word Problems, i.e. problems presented in a verbal form, which, in order to be solved, should be translated into the mathematical language. Several tutorials for such a translation are provided elsewhere.

    Word Problems

  1. A Word Problem with Pens and Pencils
  2. Abdul and 10 Thieves
  3. Billy is twice as old as Sally
  4. Cars and motorcycles
  5. Child and Adult Ticket Count
  6. Coin counting word problem
  7. Crab's Weight
  8. Diluted Paint
  9. Five siblings
  10. Half an egg wonder
  11. How old is Al?
  12. How old is Karen?
  13. Lemons by Dozen
  14. Problem #24 from the Rhind Papyrus
  15. Sweet Purchase
  16. The ass and the mule
  17. The lucky find
  18. Thirty Clerks

    Logic

  19. Knights and Knaves #1
  20. Knights and Knaves #2
  21. Knights and Knaves #3
  22. Robbery #1
  23. Robbery #2
  24. Robbery #3
  25. Robbery #4
  26. Sons and Fathers
  27. Who Has the Beard?

    Arithmetic

  28. Food of a Lifetime
  29. Insect flight record
  30. M. Jordan and K. Abdul-Jabbar
  31. "Math trick" with two dice
  32. Planeload
  33. Two Consecutive Numbers with Small Sum

    Algebra

  34. A Cryptarithm for Middle School
  35. A Typical Age Problem
  36. All Powers of x are Constant
  37. Four Weighings Suffice
  38. Rabbits Reproduce; Integers Don't
  39. Ratios and Sharing
 

    Probability

  1. Multiple of 3 out of the Box
  2. Number Theory

  3. AB × BA = 3154.
  4. A Cryptarithm: A + HA = HEE
  5. Primes as differences of squares
  6. Simple division by 7
  7. Smallest multiple of 9 with no odd digits
  8. Three digit twister
  9. When 3AA1 is divisible by 9?
  10. When 3AA1 is divisible by 11?

    Geometry

  11. Angle Subtended by a Diameter
  12. Base and Area of an Isosceles Triangle
  13. Construction of the Angle Bisector
  14. Construction of the Perpendicular Bisector
  15. Existence of the Circumcenter
  16. Pedoe's Theorem
  17. Running Lemming
  18. Square in a Right Triangle
  19. Three Congruent Rectangles
  20. Three Touching Circles
  21. Triangle Areas in a Parallelogram
  22. Triangle Areas in a Parallelogram II
  23. Two Touching Circles

    Practice

  24. Addition practice with small numbers
  25. Addition practice with numbers below 100
  26. Addition practice with 3-digit numbers
  27. Multiplication practice with small numbers
  28. Multiplication practice with 2-digit numbers
  29. Subtraction practice with small numbers
  30. Subtraction practice with numbers below 100
  31. Subtraction practice with numbers below 1000

References

  1. T. Gardiner, More Mathematical Challenges, Cambridge University Press, 2003
  2. T. Gardiner, The Mathematical Olympiad Handbook, Oxford University Press, 1997.

Copyright © 1996-2010 Alexander Bogomolny

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