Show:
Rectangular Arrays (1.2)
Factors (1.3)
The Factor Captor Game (1.4)
Divisibility (1.5)
Prime and Composite Numbers (1.6)
100
True of False: In a rectangular array, each row has the same number of objects.
True
100
Whenever two or more numbers are multiplied to give a product, each of the numbers that is multiplied is called a_______________________.
factor
100
Is 1 a factor of 15? Why?
Yes! 1 x 15 = 15.
100
Is 16 divisible by 2? Why?
Yes! 16 is an even number. Therefore, is MUST be divisible by 2.
100
A counting number greater than 1 that has exactly two factors- 1 and the number itself is a_____________?
Prime Number
200
How many rectangular arrays can you make with 12 counters?
There are 6 possible ways. 1. 1 row , 12 columns 2. 12 rows, 1 column 3. 2 rows, 6 columns 4. 6 columns, 2 rows 5. 3 rows, 4 columns 6. 4 rows, 3 columns
200
List all of the factors of 6.
1, 2, 3, 6
200
True or False: A number is divisible by another number if the result of the division has a remainder.
False: A number is divisible by another number if the result of the division is a whole number with no remainder.
200
Is 25 divisible by 6? Why?
No! - 25 ends in 5 so it must be divisible by 5. -25 is an odd number which means it is not divisible by 2. In order for a number to be divisible by 6 it MUST be divisible by 2 & 3. -25 divided by 6 is 4 with a remainder 1.
200
True or False: 1 is a prime number.
False! The number 1 is considered neither prime nor composite.
300
What is the number model for a rectangular array with 4 rows of 6 columns?
4 x 6 = 24
300
List all of the factors of 20.
1, 2, 4, 5, 10, 20
300
Show the FACTOR CAPTOR Grid 1: In the FACTOR CAPTOR GAME, if you chose 18, which numbers would your opponent be able to capture?
1, 2, 3, 6, 9
300
Is 237 divisible by 3 ? Why?
Yes! 2 +3 +7=12, and 12 is divisible by 3!
300
Is 21 a prime or composite number? How can you tell?
21 is a composite number. It has more than two factors, (1, 3, 7, 21) Therefore, it is considered a composite number.
400
Bob has 14 tulip bulbs. He wants to plant them in a rectangular array consisting of at least 2 rows with AT LEAST 4 bulbs in each row. Draw the possible array. Then, write the number model next to the array.
SHOW ON ANSWER KEY! Number Model: 2 x 7 = 14 tulip bulbs
400
What are the factors of 36?
1,2,3,4,6,9,12,18,36.
400
Show the FACTOR CAPTOR Grid 2: Pretend that you are playing Factor Captor on the number grid. The crossed out number have already been picked. If you chose 21 on the grid, which number(s) would your opponent be able to capture?
3
400
Is 7,002 divisible by 9?
Yes! 7+2=9; and 9 is divisible by 9.
400
Is 31 a prime or composite number? How can you tell?
31 is a prime number. Its only factors are 1,31 (1 and itself). Therefore, it is a prime number.
500
Mr. Martin has 24 bulbs. He wants to plant them in a rectangular array consisting of at least 2 rows with at least 2 tulips in each row. Draw three possible arrays.
Show on ANSWER KEY
500
Write all of the number models for the number 27. Then, write all the possible factors.
1 x 27=27 27 x 1=27 3 x 9 = 27 9 x 3= 27 Factors: 1, 3, 9, 27
500
List all of the factors for 100
1, 2, 4, 5, 10, 20, 25, 50, 100
500
Is 552 divisible by 2, 3, and 6? Why?
Yes. 552 is an even number so it is divisible by 2. 5+5+2=12; and 12 is divisible by 3 552 is divisible by BOTH 2 and 3 so it has to be divisible by 6.
500
List the prime numbers between 15 and 25.
17, 19, 23