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Suppose you couldn't count to five. (Difficult to imagine, I admit � but then for each of us there was a time when this was actually true!)
Now look at your hands. If your were unable to count to five, how would you know there are the same number of fingers on each hand? You couldn't count the fingers on one hand, and then count the fingers on the other hand, to see that there were the same number of fingers on each, because you couldn't count that high. What could you do? The answer is simple: place the thumb of your right hand against the thumb of your left hand. Then place your index fingers together, and then all the other fingers, in a one-to-one match-up. When you are done, each finger of each hand is matched to the corresponding finger of the other hand, with none left over on either side. You still don't know how many fingers are on each hand, but you do know that they are the same number.