
Seventy
Three
Thanks Bob K Find
a piece of paper, a pencil, a calculator and a friend
Write 73 on a piece of paper, fold it up, and hand it to your unsuspecting friend. Ask your friend select a fourdigit number and enter it twice into a calculator. Example : 23452345 Ask your friend to divide this number by 137. Example : 23452345 / 137 = 171185 Now ask your friend to divide the answer by his original fourdigit number Example : 171185 / 2345 = 73 Ask your friend to look at the folded piece of paper. You are a Math Magician! Why this happens : Entering a fourdigit number twice (23452345) is equivalent to multiplying it by 10001.(2345 x 10001 = 23452345). Since 10001 = 73 x 137, the eightdigit number will be divisible by 73, 137, and the original fourdigit number.
