Thirteen Thursday
Here are thirteen interesting facts about the number thirteen.
1. The number thirteen is a Happy Number.
To decide if a number is a happy number you begin by separating it's digits. Square each digit and find their sum. Then separate the digits of the sum, square them and find their sum. Repeat this process until you get the number 1. If you do, your original number is a happy number.
2. The number thirteen is a Prime Number.
3. The digits in the number thirteen are the first two positive odd numbers.
4. The number thirteen is a Centered Square Number.
A centered square number is the sum of two consecutive square numbers. Each term is also two times the number squared, minus two times the number plus one. Below are the first six centered square numbers. Can you figure out what would be the next in the list?
Here is a challenge you could try if you are interested.
5. There will be TWO Friday the 13ths in 2018.
6. There are thirteen Archimedean solids. An Archimedean solid is a symmetric, semi-regular convex polyhedron composed of two or more types of regular polygons meeting in identical vertices.
You can find printable paper templates of each of the Archimedean solid here. How many can you fold and put together?
7. The number thirteen and it's reversible number have reversible squares.
8. The number thirteen is the seventh number in the Fibonacci sequence.
In the Fibonacci sequence every number after the first two is the sum of the two preceding ones. The Fibonacci sequence appears often in mathematics and in nature.
Can you think of somewhere you might have seen it?
9. A dozen is twelve, but a baker's dozen is thirteen.
The definition of a dozen is 12, but a baker's dozen is 13. That means there are 12, plus one for the baker to taste.
10. There are thirteen cards in each suit in a standard deck of cards.
10. The number thirteen is thought to be an unlucky number.
One of the most popular theories about the unluckiness of the number 13 has "Biblical" origins. Tradition (not the Bible) says that Judas was the 13th person to take his seat at the Last Supper. Judas later betrayed Jesus. There are also scholars who believe that the date of the Last Supper was on the 13th of Nisan (Jewish calendar) others think the crucifixion was on the 13th.
11. There is a term for people who are afraid of the number thirteen.
11. In Italy, the number thirteen is a lucky number.
It is thought that the origins of a standard deck of playing cards came from Ancient Egypt. In each deck there are 13 cards in each suit, from Ace to King, which are thought to represent the 13 weeks in one season. There are four suits for the four seasons. 13 x 4 = 52. There are 52 weeks in one year.
10. The number thirteen is thought to be an unlucky number.
One of the most popular theories about the unluckiness of the number 13 has "Biblical" origins. Tradition (not the Bible) says that Judas was the 13th person to take his seat at the Last Supper. Judas later betrayed Jesus. There are also scholars who believe that the date of the Last Supper was on the 13th of Nisan (Jewish calendar) others think the crucifixion was on the 13th.
11. There is a term for people who are afraid of the number thirteen.
11. In Italy, the number thirteen is a lucky number.
In Italy 13 is considered a lucky number unless there are 13 people at the dinner table. This is also due to the idea that Judas was the thirteenth person at the table with Jesus for the Last Supper.
12. The U.S. flag has thirteen stripes.
The original flag of the United States of America had 13 stars and 13 stripes to represent the 13 original colonies. The current flag has 50 stars for the 50 states and 13 stripes.
13. You will be 13 years old at some point while you are our student!
Most of our seventh and eighth-grade students will be 13 at some point during this school year. Turning 13 is a very important milestone. You are no longer considered a child, but are now officially a TEENAGER!
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