The Number 25

Some Interesting Math and Everyday-Life Facts About 25

By Adrian Signell

I Chose 25 Because…I Chose 25 Because…

• I wanted to know more about 25 in I wanted to know more about 25 in general.general.

• I see it very often in everyday-life and I see it very often in everyday-life and wanted to know more about it, in what wanted to know more about it, in what cultures it’s special, etc.cultures it’s special, etc.

Math Facts About 25

• 25’s Factors are 1,5 and 2525’s Factors are 1,5 and 25• It is a square number (5x5)It is a square number (5x5)• It is an odd numberIt is an odd number• It is a composite numberIt is a composite number• Can be dived into 100 EquallyCan be dived into 100 Equally• Is a forth of 100Is a forth of 100

Interesting Facts About 25

• December 25 is known as Christmas Day• Pachisi (Hindu word for 25) is one of the national games of

India• It takes 25 earth days for the sun to complete a rotation on

itself• 25 is the number of years of marriage marked in a silver

wedding anniversary.• 25 is the name of the national card game of Ireland• Spanish football goalkeeper Pepé Reina wears kit number

25

Prime Time Pg.21

Would you’re special number be a good starting number in the factor and product game? Why or Why not?

The number 25 would be a good starting number in the factor game because you would get 25 points and your opponent would only get 6 points. However, 25 would not be a good starting number in the product game because 25 is on the far left side of the game board when your trying to get a number in the middle.

Prime Time Pg. 36

Is your special number odd or even? Explain.The number 25 is an odd number because it is not divisible by

2 and every even number is divisible by 2.

What are the factor pairs of your special number?

The factor pairs of 25 are 1 and 25, 5 and 5 (square).

Prime Time Pg.60

The prime factorization of 25 is:

25/ \

5 x 5

In other words: 5x5

Ending Quiz

What Relationship Does The Sun Have With 25?

a. The average temperature on the sun is 25 degrees Celsius.

b. It takes 25 Earth days for the sun to make a full rotation on itself.

c. The sun’s mass is 25 billion Kg.

d. If you’re within 25km of the sun you will melt.

WRONG!

You should work on your listing skills…

WRONG!

Could you have done any worse????

WRONG!

My great-great grandmother has better hearing than you…

and she’s dead!

CORRECT!

I will personally speak with Ms. Maggie about

your great listening skills.

THE END!Hope you enjoyed Adrian’s

marvelous slide show about the number…

25!