Arithmetic

Daniel Mentrard, Feb 17, 2022


  • 1. First polygonal numbers
  • 2. Fractions and hours or split time
  • 3. Time! But what time?
  • 4. Compare decimals
  • 5. The Fraction Clock
  • 6. Les tables de multiplication amusantes
  • 7. Le pont
  • 8. Soustraction des nombres relatifs
  • 9. La soustraction en double méthode
  • 10. Prime factors tree
  • 11. Glisse nombre et multiplication division par 10,100,....
  • 12. Paper formats and the geometric sequence
  • 13. Fraction division
  • 14. Riemman sum and integration
  • 15. Catch the good ball (table of multiplication)
  • 16. Arithmetic mean vs geometric mean (proof without word)
  • 17. Sum of 7 consecutive intergers
  • 18. Le complémentaire à 10 et l'addition
  • 19. The house of additions
  • 20. A way to find the value of a square root?
  • 21. Countdown (a new way to learn tables of multiplication)
  • 22. Multiplication tables while having fun
  • 23. The table of 9 using the tens
  • 24. Sum of two relative numbers
  • 25. Multiplication table in 3D
  • 26. The multiplication wheel
  • 27. Multiplication tables by areas of rectangles (and squares)
  • 28. Une pendule pédagogique
  • 29. Proof without words : Sum of the first n integer numbers
  • 30. Proof without words : Sum of alternate squares
  • 31. Properties of the N-gonal numbers (peacock theorem)
  • 32. PacMath(3) : Compare two decimal numbers
  • 33. PacMath series : inequalities
  • 34. Relation between pentagonal and triangular numbers
  • 35. How to Find the Divisors of a integer Number
  • 36. Proof without word : Sum of the odd numbers
  • 37. Fraction, percentage and coefficient
  • 38. Fractions and hours
  • 39. The City bus problem
  • 40. The bridge and the train (addition for children)
  • 41. Math trick to square a number
  • 42. The secret of pyramids
  • 43. LCM,HCF and Venn diagram
  • 44. Addition and elementary puzzle
  • 45. Pyramid stacks
  • 46. Propertie of the square roots
  • 47. Pendulum with unrolled dial
  • 48. Square roots in spiral vs in function
  • 49. Proof without word: arithmetic sequences
  • 50. Smilog : properties of the logarithms(2)
  • 51. Smilog: properties of the logarithms (1)
  • 52. The sum of the first n cubes
  • 53. Decomposition of a decimal number
  • 54. The unrolled clock
  • 55. The staircase multiplication tables
  • 56. Geometric polygonal peacock
  • 57. N-gonal Numbers

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First polygonal numbers

– Daniel Mentrard

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