Prime or Composite?
How would you describe a prime number? How would you describe a composite number? What is different between the two
Prime number: A number whose factors are one and itself (ie. 13 1X13=13 is the only way to multiply to 13)
Composite: A number who has more than one factor. (ie. 4 1X4=4 and 2X2=4)
Find all the factors of the number 2.
(HINT! Factors are ways to MULTIPLY to the number NOT add)
The only factors of 2 are 1 and 2
1x2=2
Complete the pattern!
N+3
3, ____, 9, ____
3,6,9,12
How do you know if a number is prime?
Mylz is drawing Starwars characters. He draws three pictures every day. How many pictures are we adding every day?
He adds three pictures to his collection every day
Is 10 prime or composite? How many ways can you multiply to 10?
10 is composite, you can multiply to 10 2 ways (1x10=10 and 2x5=10)
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Find all the factors of 14
(HINT: Find all the ways you can MULTIPLY to 15 NOT ADD!)
1,2,7,14
Finish the pattern!
N+5
5,10,___,___, 25
5,10,15,20,25
How do you know if a number is composite?
If you can multiply to the number multiple ways.
Mylz is drawing Starwars characters. He draws three pictures every day. He has 6 total on day 2 and 9 total on day 3. How many pictures will he have on day 5?
What is the only even number that is prime?
2, the only way to MULTIPLY to 2 is 1X2=2
Find all the factors of 30
HINT: all the ways you can MULTIPLY (make even groups) NOT ADD
1x30=30
2x15=30 (we know that 4 isn't a factor because we can't split 15 in half evenly to make 4 equal groups)
3x10=30
5x6=30 (we know we are done finding all the factors because 5 and 6 are next to each other!)
6,___,18,___,24,___
N+6
6,12,18,24,30
How do you know when you have found all the factors?
When the factors come one after another and there are no numbers in between .
Example:
15: 1,3,5,15 (3 and 5 are next to each other and 4 is not a factor)
6: 1,2,3,6 (2 and 3 are both right next to each other and there is no number in between)
JJ collects pokemon cards. He is allowed to buy 7 packs every month. During the first month he bought 7, during the second month he had bought 14, during the third month how many did he have?
What is the pattern?
is 15 prime or composite?
15 is composite (1x15=15, 3x5=15)
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Find all the factors of 45
1,3,5,9,15,45
1X45=45
3X15=45
5x9=45
___, 12,24,___, 48,___
N+12
0,12,24,36,48,52
What numbers should you check if you're not sure if a number is prime or composite?
-2, see if you can split it in half
-3, see if the number is odd as well as composite
-4, see if you can split the group of 2 in half again
-5, see if the number is odd as well as composite
JJ collects pokemon cards. He is allowed to buy 7 packs every month. During the first month he bought 7, during the second month he had bought 14, during the third month how many did he have? How many did JJ have by the 5th month?
week 3: 21 packs of Pokemon cards
week 5: 35 packs of pokemon cards
Is 99 prime or composite?
99 is composite (1x99=99, 3x33=99, 11x9=99)
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Find all the factors of 100
-Have everyone try to find at least 1 besides 1x100 and draw a model :)
1x100
2x50
4x25
5x20
Angelina is collecting stickers. After one week she has collected 3 stickers. At the end of week 2 she has collected 5 stickers total. At the end of week 3 she has collected 7 stickers. If the pattern continues how many stickers will she have by week 6? What is the pattern?
By week 6 she will have 13 stickers.
Pattern is N+2
Bosco is an avid reader, he loves to read. He goes to Powells to buy out books every month! Bosco is allowed to buy 4 books every month. In the first month he bought 4 books, in the second month he had 8, in the third month he had 12. What is the pattern? If this pattern continues, after one year (12 months) how many books would Bosco have bought?
pattern: n+12
In 12 months Bosco bought: 48 book total!