Question 3
These
nine counters have the same number on each side, but a coloured green on
one side and yellow on the other side.
The Challenge
In what different ways can you turn over two of the
counters to make the total of the green counters the same as the total on
the yellow counters?
What if you had to turn over 3, 4, 5, 6 or even 7
counters? Is it still possible to make the total on the green counters the
same as the total on the yellow counters each time?
If you would like some help with this one, click on the
link below to open up an applet that will keep a score of the totals as
you go.
Turn
Over Counters Applet