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# My Special Number Project

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## Mia DiCera

on 26 October 2015

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#### Transcript of My Special Number Project

My Special Number Project
21

Why is 21 Special to Me?

List 3 Mathematical Things About 21?
Share a video, an article or a picture that you can find that involves your special number linking it to the real world.
List 2 connections between your number and the real world.
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

21 is special to me because...
1. My birthday is on November 21st
2. It's my golden birthday
3. It is my luckey number
21
21
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.
+
-
x
From 1958-1980, there was a player on the Blackhawks named Stan Mikita. He was number 21.
Stan Mikita Video:

http://blackhawks.nhl.com/club/page.htm?id=63469
21x21=441

21x21x21=9261

Using three steps of the order of operations, make an expression that evaluates to equal your number
(21x21)/21+8-8=21
Use your number as the variable x in the expression 2(5x+3):
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.
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
Yes
Yes
yes
yes
yes
yes
yes

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
3
7
x
21=3x7
Full transcript