Definitions
Pairs of numbers multiplied together to find a product are called____________.
Factor Pairs
Show me all the arrays of 12
1 by 12
2 by 6
3 by 4
Find all the factors of 15.
1 x 15
3 x 5
How many factor pairs go into 8?
a. 1
b. 3
c. 2
C
The music director is trying to find the best way to arrange 12 chairs for a performance. The chairs must be arranged in a rectangular array. Show two ways that the chairs can be arranged.
2 x 6/6 x 2
4 x 3/3 x 4
1 x 12/12 x 1
The numbers that are multiplied together to give a product are called __________.
Factors
Make all the arrays of 32.
1 by 32
2 by 16
4 by 8
Find all the factor pairs of 16.
1 x 16
2 x 8
4 x 4
Which of the following are factors of both 18 and 42?
a.) 3,6
b.) 3,6,1
c.) 2,5,6
B
Megan is in charge of arranging the brownies at the bake sale. There are 18 brownies. What ways you can arrange them?
1 x 18
2 x 9
3 x 6
A way of displaying objects in rows and columns is called an _________.
Array
Make the arrays of 18.
1 by 18
2 by 9
3 by 6
Find all the factor pairs of 40?
1 x 40
2 x 20
4 x 10
5 x 8
Which of these factors below have 2, 3, and 4 as factors?
a. 33
b. 86
c. 72
C
Fourth graders at Ames school have 24 carpet squares. What are all the different ways they can organize the carpet squares.
1 by 24
2 by 12
3 by 8
4 by 6
One of the tools used to make arrays is _____ paper.
Grid
Make the arrays of 23
1 by 23
Find all the factors of 87.
1 x 87
3 x 29
Which is not a factor pair of 36.
a. 3 x 13
b. 3 x 12
c. 9 x 4
A
Betty made 45 cupcakes for the bake sale. What are all of the ways she can arrange the cupcakes to create equal rows and columns?
1 by 45
3 by 15
5 by 9
A number greater than 1 that has exactly two factors is called a ______ _________.
Prime number
Show me all the arrays of 49
1 by 49
7 by 7
Find all the factors of 100.
1 x 100
2 x 50
4 x 25
5 x 20
10 x 10
Which of these numbers are prime?
a. 59
b. 49
c. 51
A
Jane says 5 is a factor of every whole number that has a 5 in the ones place. Fred says 5 is a factor of every whole number that has a 0 in the ones place. Who is correct?
They are both correct.