Q:
# What are some examples of math trivia?

A:
### Quick Answer

**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.

Credit:
Todor Tsvetkov
Vetta
Getty Images

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.

Learn more about Numbers-
Q:
## What is pi in math?

A:

Full Answer >**Pi is a mathematical constant and irrational number representing the ratio of a circle's circumference to its diameter with a value of approximately 3.1416.**Even though mathematicians using computers are able to calculate an approximate value for pi to 2.6 trillion digits, its exact value remains unknown. The symbol for this constant is the lowercase Greek letter pi.Filed Under: -
Q:
## What are the common rules when adding significant figures?

A:

Full Answer >**When adding numbers, the rules of significant figures dictate that the sum should be rounded to the same place as the least significant place of the number, with the least number of places after the decimal point.**Significant figures are important when recording and relaying scientific data because they provide the reader with an idea of how best one can report/measure data.Filed Under: -
Q:
## What are some facts about the number 18?

A:

Full Answer >**Some facts about the number 18 are that it is the only positive number that is equal to the sum of the digits multiplied by two, it is the atomic number of Argon and there are 18 holes on most golf courses.**The number 18 is also the age at which United States citizens are legally allowed to vote.Filed Under: -
Q:
## How do you find the magnitude of a complex number?

A:The magnitude, or modulus, of a complex number in the form z = a + bi is the positive square root of the sum of the squares of a and b. In other words, |z| = sqrt(a^2 + b^2).

Full Answer >Filed Under: