Calcrostic Puzzle
We call these problems calcrostic because they are showing calculations in a form similar to acrostic word puzzles. The color in the puzzle is used to indicate the computations in the rows, columns and diagonals. In a calcrostic, like
ab × cd = ebaf
+ × ÷ ÷ −
egf × h = hdc
= = = = =
ejc × k = bfj
each letter represents a digit (one of 0,1,2,3,4,5,6,7,8,9).
Equal letters represent equal digits, different letters represent
different digits. The 9 resulting numbers
ab, cd, ebaf, egf, h, hdc, ejc, k, bfj
may have more than one digit (for example, ab is a 2-digit
number) and are arranged in a 3 × 3 square as above. These
numbers satisfy 3 horizontal, 3 vertical and 2 diagonal relations
(like the diagonal relation ab × h = bfj where
× stands for multiplication and ÷ for
division. The problem is to find the value of each letter.
For example, the puzzle above has the solution
54 × 27 = 1458
+ × ÷ ÷ −
108 × 9 = 972
= = = = =
162 × 3 = 486
Simpler versions of this type of puzzle will appear in future
caribou contests, starting January 2010.
Have fun!
Scheduled Contests
(on Wednesdays)
FEBRUARY 15TH, 2012APRIL 18TH, 2012
MAY 9TH, 2012
Previous Results
Caribou_Jan_18_2012_Grade_7_8
Top 10
1st
Milan Digiuseppe
Bishop E.Q. Jennings, ON
Bishop E.Q. Jennings, ON
2nd
Yixin Jiang
Dolphin Senior P.S., ON
Dolphin Senior P.S., ON
3rd
Jarod Morgenroth-rebin1
Allan Drive Middle School, ON
Allan Drive Middle School, ON
4th
Jeffrey Dawson
Citadel Middle School, BC
Citadel Middle School, BC
5th
Thomas Farrell
Citadel Middle School, BC
Citadel Middle School, BC
6th
Kevin Park
Bliss Carman Middle School, NB
Bliss Carman Middle School, NB
7th
Darren Cheung
Westmount P.S., ON
Westmount P.S., ON
8th
Jennifer Kim
North & South Esk Regional High School, NB
North & South Esk Regional High School, NB
9th
Alex Foley
Centennial P.S., ON
Centennial P.S., ON
10th
Alexandre Macdonald
École François-Buote, PE
École François-Buote, PE
Caribou_Jan_18_2012_Grade_5_6
Top 10
1st
Evan Feld
Dolphin Senior P.S., ON
Dolphin Senior P.S., ON
2nd
Shiv Kathuria
Sandhills P.S., ON
Sandhills P.S., ON
3rd
Willie Lei
Sandhills P.S., ON
Sandhills P.S., ON
4th
Soorna Choheili
Aurora Senior P.S., ON
Aurora Senior P.S., ON
5th
Lauren K
William Dunbar P.S., ON
William Dunbar P.S., ON
6th
Sean Wang
Irwin Park Elementary, BC
Irwin Park Elementary, BC
7th
Derek Xu
Erin Centre Middle School, ON
Erin Centre Middle School, ON
8th
Lyndon T
Laurelwood P.S., ON
Laurelwood P.S., ON
9th
Zaki Sayyid
Empire P.S., ON
Empire P.S., ON
10th
Frank Yi
Kwayhquitlum Middle School, BC
Kwayhquitlum Middle School, BC
Caribou_Jan_18_2012_Grade_3_4
Top 10
1st
Michael Yang
Adrienne Clarkson E.S., ON
Adrienne Clarkson E.S., ON
2nd
Navya Sheth
Oakville Public Library, ON
Oakville Public Library, ON
3rd
Kerwin Ho
Aurora Senior P.S., ON
Aurora Senior P.S., ON
4th
Zed L
Laurelwood P.S., ON
Laurelwood P.S., ON
5th
Ananya Chadha
Havergal College Junior School, ON
Havergal College Junior School, ON
6th
Michael Li
Doncrest P.S., ON
Doncrest P.S., ON
7th
Steven Zhang
Forest Hill Jr. & Sr. P.S., ON
Forest Hill Jr. & Sr. P.S., ON
8th
James Iansavitchous
Blessed Kateri, ON
Blessed Kateri, ON
9th
Nathan Cushing
Eagle Ridge Elementary, BC
Eagle Ridge Elementary, BC
10th
Sean Vasserman
Michael Cranny E.S., ON
Michael Cranny E.S., ON