# The number 45. Math facts, music facts, movie facts and other fun facts of forty five.

**Fun facts about the number 45**

In music, there are lots of songs with the number 45 in them, some of these include, “45 and Fat” by Baby bird, “45” by Elvis Costello and in the song “Brimful of Asha” by Cornershop the number 45 is repeated several times in the lyrics.

In history, 1945 saw the end of World War 2 and 1745 saw the Jacobite Rising in Great Britain.

In the movies, .45 was a2006 thriller film featuring Milla Jovovich.

In geometry, the name of a 45 sided shape is known as a tetracontakaipentagon.

Sapphire represents a 45^{th} wedding anniversary.

In chemistry 45 is the atomic number of rhodium.

In football (soccer), each half is made up of 45 minutes.

**Here are some math facts about the number 45:**

The number 45 is an odd number.

The number 45 has 6 factors which are 1,3,5,9,15 and 45.

Two are these factors are prime factors which are 3 and 5.

45 can also be written as 3² x 5 as a product of prime factors.

The square of 45 is 2025 and the square root of 45 is 6.71 (to 3 significant figures)

45% as a fraction is 9/20 or 0.45 as a decimal.

If you add up the first 10 digits in the decimal number system you get 45 (0+1+2+3+4+5+6+7+8+9)

45 is the next triangular number after 36.

In the binary number system 45 can be written as 101101.

In the hexadecimal number system 45 can be written as 2D.

In Roman Numerals the number 45 can be written as XLV.

**Popular conversions involving the number 45:**

If you travelled a distance of 45 miles then this would be equivalent to 72.4 kilometers.

Also a length of 45 feet is equivalent to 13.7 meters.

A weight of 45 pounds is equivalent to 20.4 kilograms.

If an area of land is 45 square miles then this is equivalent to 116.5 square kilometers.

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