My Special Number Project

My Special Number Project

21

List all the factors of your number:

1,3,7,21

List the first five multiples of your number:

21,42,63,84,105

Is your number prime or composite? Explain why:

21 is composite, because 21 can be divisible by 3 or 7. It has more factors, than 1 and itself.

Find the prime factorization of your number:

21

Is your number divisible by:

3

21=3x7

x

7

Square your number

2 21/2=10.5 decimal

3 21/3=7

4 21/4=5.25 decimal

5 21/5=4.2 decimal

6 21/6=3.5 decimal

9 21/9=2.3 bar notation decimal

10 21/10=2.1 decimal

Use your number as the variable x in the expression 2(5x+3):

Yes

Yes

yes

yes

yes

yes

yes

2(5x21+3)=

2(105+3)=

2x108=216

Use your number as the side length of a square. Find the area of that square. Be sure to use all your steps using the formula.

Area=sxs

Area=21x21

Area= 441sq.in.

21x21=441

Cube your number

21x21x21=9261

Using three steps of the order of operations, make an expression that evaluates to equal your number

(21x21)/21+8-8=21

List 3 Mathematical Things About 21?

Why is 21 Special to Me?

-

Share a video, an article or a picture that you can find that involves your special number linking it to the real world.

21 is special to me because...

x

1. Half of 21 is 10.5

2. Chemistry, 21 is the atomic number of Scandium.

3. In Bingo, ball number 21 is called key of the door.

21

From 1958-1980, there was a player on the Blackhawks named Stan Mikita. He was number 21.

1. My birthday is on November 21st

2. It's my golden birthday

3. It is my luckey number

Stan Mikita Video:

http://blackhawks.nhl.com/club/page.htm?id=63469

List 2 connections between your number and the real world.

21

+

1. There are 21 forwards and defence men combined on the 2015-2016 blackhawks team.

Player Teuvo Teravainen number 86 on the blackhawks is 21 years old