Arrays
Draw an array for 4 groups of 4.
* * * *
* * * *
* * * *
* * * *
What do we call groups that have the same number of objects?
Equal groups
9 X 6
54
9 +9 + 9 + 9 + 9 +9 + 9
63
John bought 7 video games. Each game had seven characters in it. How many characters were there altogether?
49 video game characters
Write a multiplication sentence for this array:
* * * * * * *
* * * * * * *
* * * * * * *
3 x 7
What is a factor?
One of the numbers in a multiplication problem.
8 X 8
64
8 + 8 + 8 + 8 + 8
40
Mrs. Smith teaches 8 math classes in one day. Each class has six students. How many students does she teach in one day?
48 students
What is an array?
A set of objects in rows and columns
What is a product?
The answer to a multiplication problem.
10 x 5
50
6 + 6 + 6 + 6 + 6 + 6 + 6
42
Mrs. Salmon bought multiplication flashcards. Each box held 10 cards. She bought 9 boxes. How many flashcards did she have in all?
90 flashcards
Write a multiplication sentence for an array that has 5 rows with six objects in each row.
5 x 6
What is an estimate?
An answer that is close to the exact amount.
7,843 x 1
7,843
3 + 3 + 3 + 3 + 3 + 3 + 3 + 3
24
Mrs. Michalak bought pencils for her math class. Each box contained 7 pencils. She bought 6 boxes. How many pencils did she buy?
42 pencils
Make an array for 4 x 9 and solve that equation.
* * * * * * * * *
* * * * * * * * *
* * * * * * * * *
* * * * * * * * *
Commutative Property of Multiplication?
The property that states that you can group factors in different ways and still get the same product
8 x 7
56
7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7
63
Panav runs 3 miles a day for 5 days during the week. How many miles will Panav run in two weeks?
50 miles