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1.2 UNDERSTANDING
ARITHMAGON
Look at the following triangle. It has some numbers written on the edges.
Let us learn to solve this triangle puzzle using addition and subtraction.
We have to fill the circles with numbers.
The bottom square has 4 written in it.
The circles on both sides of this square
should have numbers that add up to 4.
7 5
Step 1 Choose the smallest number
(here 4).
Step 2 Make combinations (for
4 example, 3 + 1 = 4 or 2 + 2 = 4)
to fill in the neighboring circles:
pink and blue.
Step 3 When you have the possible
4 answers, you will make a
similar list for the second
smallest number (here 5).
Step 4 When the above steps give the
same numbers in the number
7 5 combination, then it means
you have got your answer.
Step 5 The circle for the biggest
number gets filled
automatically.
3 4 1
An arithmagon is a polygon with numbers at its vertices
which determine the numbers written on its edges.
Level 1: Reasoning 11

