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# What are some examples of math trivia?

**Some math trivia examples include these facts: The middle digit of a three-digit answer to the multiplication of any number by 11 is the sum of the other two digits, or 21 x 11 = 231, while 2 + 1 = 3.** The sum of the digits of the result of multiplying a number by 9 is always 9; 2 x 9 = 18, while 1 + 8 = 9.

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Another fun trivia fact is that the number 142,847 is cyclic, meaning that its digits switch positions in a cycle when the figure is multiplied by any number from 1 to 6. For example, 142,857 × 1 = 142,857, while 142,857 × 5 = 714,285, 142,857 × 4 = 571,428 and 142,857 × 6 = 857,142. When multiplying 1089 by 9, the answer is its exact reverse: 9801.

Most mathematical symbols were invented in the 16th century, before which math problems were expressed in words. The Fibonacci sequence is manifest in nature. An example of the Fibonacci sequence includes the pattern of leaves around the stems of some plants.

Another trivia fact is that the name Google originated with the misspelling of the term "googol," which is the number 1 followed by 100 zeros. Lastly, a ratio of 1.618 is called the golden ratio.

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