Prime or Composite
What is a prime number?
Prime numbers only have 1 FACTOR PAIR, 1 and itself.
ex/ 5 is prime because we can only multiply into 5 with the factor pair 1 and 5 (1x5=5)
What is a factor pair?
Two numbers that are multiplied together to get a product.
Example:
(3, 4) is a factor pair of 12 because 3 × 4 = 12.
What does "Divisible" mean?
A number is divisible when it is able to be divided into equal groups
1, 4, 7, 10
What is the pattern rule?
Start with 1 and ADD 3
What are the first five terms of the pattern when you start with 18 and add 9?
18, 27, 36, 45, 54
(18 +9), +9, +9, +9
Is the number Prime or Composite?
7
7 is Prime
(1, 7)
What are the factor pairs for number 8?
(1, 8)
(2, 4)
True or False...
If a number is EVEN, that means it is divisible by 2
TRUE
25, 36, 47, 58
What is the rule for the pattern?
Start at 25 and ADD 11 each time
Start with 30 and subtract 3 each term
(follow the pattern with 5 terms)
30, 27, 24, 21, 18
Is the number Prime or Composite?
45
45 is Composite
(1, 45) (3, 15) (5, 9)
What are the factor pairs for the number 20?
(1, 20)
(2, 10)
(4, 5)
Is the number 70 divisible by 5?
YES
(70 divided by 5 = 14)
What is the pattern rule?
2, 6, 18, 54, 162
Start with 2 and MULTIPLY by 3
Livvy plants daffodil bulbs in her garden. In the first row she plants 5 bulbs. She plants another row with 1 additional bulb.
If she continues this pattern, how many bulbs will she plant in the fifth row?
9 bulbs
2--(5 +1=6) 3--(6+1=7)
4--(7+1=8) 5--(8+1=9)
Is the number Prime or Composite?
33
33 is Composite
(1, 33) (3, 11)
What are the factor pairs for the number 40?
(1, 40)
(2, 20)
(4, 10)
(5, 8)
True or False...
If a number ends in "0" then it is divisible by 10
TRUE
When multiplying with "10" answers will always end in "0"
Joe bikes 6 miles to the beach and back each day during summer.
What is the pattern rule? How many miles does he bike in 5 days?
RULE: start with 6 and ADD 6
TOTAL: 30 miles (If follow 5 terms)
The floor row of the movie theater has 10 seats. Each stair row has 4 more seats than the previous row.
How many seats are in the stair rows indicated?
Row 1 is 10 seats
Row 2 ____ Row 3 ____ Row 5 _____
Row1 is 10 seats
Row 2 is 14 seats
Row 3 is 18 seats
Row 5 is 26 seats
*start with 10 and ADD 4 each row
Is the number Prime or Composite?
73
73 is Prime
What are the factor pairs for the number 100?
(1, 100)
(2, 50)
(4, 25)
(5, 20)
True or False...
Number 2,752 is NOT divisible by 2
FALSE
2,752 is EVEN meaning it IS divisible by 2
What is the pattern rule?
6, 12, 15, 30, 33
Start with 6
MULTIPLY by 2, then add 3
Finish the pattern...
Start with 2, MULTIPLY by 4, then SUBTRACT 3
2, 8, 5, 20, 17, 68, 65