Prime Numbers
Published by Mazza J!! October 31st, 2006 in scribepostsTodays lesson was all about Prime Numbers. The main aims were to
- Find out all the prime numbers up to 100
and to….
- Find out how to find all the prime factors upto 100
First of all we looked at a “Sieve of Eratosthenes” which ended up looking something along the lines of this;
The numbers that are in black are all prime numbers up to 100.
Later on in the lesson Mr Jones then taught us an easy little method;
24
8 x 3
4 x 2
2 x 2
The 2,2,2,3 are all the prime numbers. They also add up times to make 24 so these are the prime factors of 24.
Hi Mhari,
I think your inaugural post as the first Scribe Poster in Scotland in Maths is just superb - and you’ve taught me a trick I didn’t know. But, for a complete numpty like me:
what is a prime number? What makes a prime number different from all the others?
What a great first scribe post. A few helpful hints. You should label your post “scribepost” so it shows up as a category. Right now it is uncategorized. I liked your image. The use of colour was excellent and illustrated your comments.
When I ask my students to scribe I ask them to include a link from the web where they can find more information. Usually they will find a site that has an interactive game or quiz on the first google search that they do.
Great first post. Keep on scribing (did you know that the word scribble came from the word scribe!)
Mr. Harbeck
Grade 8 Math Teacher
Sargent Park School
Winnipeg, Manitoba Canada
sargentparkmathzone.blogspot.com
Hi Mhari!
What a wonderful first scribe! Your use of colour really highlights the numbers that are prime from those that are not. One question though … how did you figure all this out? If I was a student in your class who was away that day would I be able to figure out how you did this?
I’m so excited to see student math scribes in Scotland. And the first one about Eratosthenes no less! Did you know that Eratosthenes wasn’t just good at math, he’s considered to be the “Father of Geography?” He used shadows and the sun to figure out the diameter of the earth …. 2500 years ago (no calculators, no computers, no electricity).. You can learn more about him here.
Can’t wait to read more scribes from your class.
Cheers,
Darren Kuropatwa
Dept. Head Mathematics
Daniel McIntyre Collegiate Institute
Winnipeg, Manitoba, Canada
hey Mhari
thats a gr8 first scribe well done!! the colours really make it alot easier to understand and that easy little method was really good too
abby
xxxxxx
Hi Mhari,
Great first post. I look forward to reading more - i think these will be really good to look back on and will help people studying maths to remember some of key lessons learned. It is certainly refreshing my memory of maths learned when I was at school!
Looks like maths is becoming great fun in North Berwick. I’m very impressed and look forward to reading more about what you’re doing in class.
hey mhari! well done on completing the first scribe post for our class. it is reeli helpful since i didnt reeli understand it so after looking at it on here i am beginning to see the pattern.keep it up mazza :).
love linzi xxxxxxxxx
ooo I’ve noticed a mistake! Don’t know if it was the one Mr Jones was talking about but anyways, i said ‘add up’ wen in actual fact you times then to get to 24! ooops!
Well spotted Mhari! If you want, you can edit the post - I’ll show you on Monday how to do it in a way that lets people see what you’ve changed.
Hey maza !!
gr8 1st blog ! Mr Jones is right, you’ve set the bar high !!! Well done
lub ! x x x