# The Number 25 (Twent-five). Mathematical Facts and Other Info About The Number Twenty Five

Here are some mathematical facts all about the number 25 (twenty-five).

The number 25 is the number between 24 and 26.

The number 25 is an odd number, as the number ends in 5.

The factor pairs of 25 are:

1 × 25

5 × 5

Therefore there are 3 divisors of 25, 1 5 and 25.

The number 5 is the only prime factor of 25.

The product of prime factors for the number 25 is 5 × 5.

The first twelve multiples of 25 are 25,50,75,100,125,150,175,200,225 and 250. All these multiple of 25 either end in 0 or 5.

If you double 25 you get 50 and half of 25 is 12.5.

25 squared is 625 (since 25 multiplied by 25 is 625).

Also, the cube of 25 is 15625 (since 25 times 25 times 25 is 15625)

The square root of 25 is 5. So 25 is also a perfect square.

25% as a decimal is 0.25 and 1/4 as a fraction.

25 can be written as the sum of two square numbers (9+16).

25 miles is about the same length as 40 kilometres (25 × 1.6).

25 gallons is about the same volume as 112.5 litres. (25 × 4.5).

25 pounds is a about the same weight as 11kg (25 ÷ 2.2).

A 2D shape made up of 25 sides is called an icosikaipentagon.

Other facts about the number 25

In Chemistry, 25 is the atomic number of manganese.

In Bingo, ball number 25 is called duck and dive.

In the United Kingdom, the motorway which circles the city of London is the M25.

If you have been married 25 years then you will be celebrating your silver wedding anniversary.

Veruca Salt wrote a song called 25.

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