
Lesson 15Handout 2
TO FIND A NUMBER THOUGHT OF First Method
Second Method
Third Method
PUZZLES
To many minds, the pleasure of making a discovery, after long
and patient investigation, is greater than any delight that can
be offered to the senses. Puzzles may be regarded as an excellent
medium for the development of such natural tendencies in youth,
combining, as they do, the elements of work and play; necessitating
also both application and perseverance, and enabling us to improve
the valuable faculty of holding several ideas in the mind at once.
The Carpenter's Puzzle
A plank was to be cut in two; the carpenter cut it half through
on each side, and found he had two feet still to cut. How was
it? The Nine Digits
Place the nine digits (that is, the several figures or numbers
under ten) I three rows, in such a way that, adding them together
either up or down, across, or from corner to corner, they shall
always make fifteen. The Accommodating Square
Make eight squares of paper, then divide four of them from corner
to corner, so that you will now have twelve pieces. Form a square
with them. The Three Rabbits
Draw three rabbits, so that each shall appear to have two ears,
while, in fact, they have only three ears between them. Fun & Games of Long Ago. (Maynard, Massachusetts: Chandler Press 1988) 