Arrays
What is the equation for the following array?
OOOO
OOOO
OOOO
What is 3 X 4 or 12 ÷ 3 = 4?
4 x 4= ___
What is 16?
Ms. Gray arranges all the desks in his classroom into 6 equal groups of 4. How many desks are in the
classroom? Show a picture and a multiplication sentence in your work.
6 x 4 = 24
There are 24 desks.
Ms. Ferruggiaro arranges all the math books into 6 equal groups of 4. How many math books does Ms. Ferruggiaro have? Show a picture and a multiplication sentence in your work.
6 X 4 = 24
She has 24 books.
What is the equation for the following array?
x x x x x
x x x x x
What is 2 x 5?
6 X 2 = ____
What is 12?
Draw an array that shows 9 rows of 2. Write a multiplication sentence to represent the array, and circle the factor that represents the number of rows.
9 x 2 =18
What does the product in the following multiplication sentence represent?
6 X 4 =24 She has 24 math books.
The product is 24.
It represents the total number of math books.
Ms. Gibbons uses the equation 4 X ____ = 40 to find how many questions the class answered correctly. Is her method correct? Why or why not?
Yes, her method is correct. I solved using division, but she is solving using multiplication.
The blank shows she is looking for a factor. 4 x 10 = 40, so she gets the same answer as 40 ÷ 4 = 10. Both show the class answered 10 questions correctly.
Draw an array that shows 8 rows of 2. Write a multiplication sentence to represent the array and circle the factor that represents the number of rows.
O O 8 X 2 = 16
O O
O O
O O
O O
O O
O O
O O
8 x 3
What is 24?
The class answered 5 questions correctly Tuesday. What is the total number of points the class earned on both days?
Monday: 4 x 10 = 40 Tuesday: 4 x 5 = 20
Monday + Tuesday = 40 + 20
= 60
The class earned 60 points on both days.
Draw another array that shows 2 rows of 8. Write a different multiplication sentence and circle the factor that represents the size of the row.
O O O O O O O O 2 X 8 = 16
O O O O O O O O
Jose decides to make his favorite lunch, grilled cheese! His recipe calls for 2 slices of cheese per one sandwich. He makes 7 sandwiches for the family on Friday.
How many cheese slices does Jose use to make the 7 sandwiches? Draw a picture and write a multiplication sentence to find the total number of cheese slices he uses for 7 grilled cheese sandwiches for Friday.
7 x 2 = 14
Jose uses 14 slices of cheese to make the 7 sandwiches.
Explain the relationship between the following two arrays using number sentences and words.
8X2=16 and 2X8=16
The arrays have the same totals, (18) and they have the same factors (2 and 9). The factors switch places. In 9X2=18, the 9 is the number of rows, but in 2X9=18 the 9 is the size of the row. It's the commutative property!
Ms. Romano arranges all the desks in his classroom into 8 groups of 4. How many desks are in her classroom? Show a picture and multiplication sentence in your work.
8 X 4 = 32
There are 32 desks in his classroom.