# #21 - Twenty One - #21

### by Ashlynn Keck

## 21

***I chose 21 because **April __21__st is my golden birthday!

*****Ellis Lankster on the New York Jets is number** 21.** (Go Jets!)

***** The factors of__ 21__ are 1,3,7,21.

***21 **is composite because it has more than 2 factors.

***21** is odd because it does not have 2 as a factor and it ends in 1.

***** April __21__st is also Queen Elizabeth's birthday!

*****Selena Gomez is age **21.**

***** Other famous athletes having #*21* were Robert Clemente, a Pittsburg Pirate Hall of Fame baseball player who played outfield. Also Mike Eruzione was on the 1980 Winter Olympic Hockey team members who scored the winning goal for the USA team to defeat the Russians. The USA team later won the gold medal.

***** The store * Forever 21* has very cute clothes to buy.

## 21 is such a cool number because...* is considered a lucky number.* * * Many people consider you an adult at age * gun salute.21 | ## Factor Tree, Square Numbers and CubedThe factor pairs of 1 × 21 3 × 7 This makes it a * * * The prime Numbers ( 3 & 7) | ## Fun Facts, Facts, Facts!*If you double *Half of
= 441. 21*The number *The first five * deficient number... 1+3+7+21=32. If you double 21 you get 42, and because 32 is less than 42, it's considered deficient by 10. |

## 21 is such a cool number because...

** 21*

__is considered a lucky number.__

* **21** is the number you try to get in black jack.

* **21** is the legal drinking age in Iowa.

* Many people consider you an adult at age **21**.

** 21* is the number of shots fired to do a military salute:

__gun salute.__

**21**## Factor Tree, Square Numbers and Cubed

The factor pairs of **21** are:

1 × 21

3 × 7

This makes it a **composite number **because it has more than 2 factors.

*__ 21__**cubed** is 9,261

*__ 21__**squared** is 441

* The **factors **of ** 21** are

**prime Numbers**( 3 & 7)

## Fun Facts, Facts, Facts!

*If you double __21__ you get 42.

*Half of **21** you get 10.5.

***21** x

**= 441.**

__21__*The number **21** is the number between 20 and 22.

*The first five** multiples **of **21** is ... 21,42,63,84,105.

*** 21** is a

**deficient number**... 1+3+7+21=32. If you double 21 you get 42, and because 32 is less than 42, it's considered deficient by 10.

## LCM and GCF OF 21 and 24

**and 24 is 168.**

__21__* The Greatest Common Factor of ** 21 **and 24 is 3.