Multiplying with __
Which bolded number makes the multiplication sentence true?
4
10 x 5 = 40
8
4
Associative Property of Multiplication:
Write another way to group the factors. Then find the product.
(6 x 1) x 4
6 x (1 x 4) = 24
True or False:
3 x 7 = 21
True
Yes or No: Does the following number sentence have the same value as 8 x 6?
6 x (4 + 4) = ___
Yes
Scarlett bought 4 movie tickets. Each ticket cost $6. What was the total cost of the movie tickets?
$24
Multiple answers
Example of one possible answer:
7 x 5 = 7 x (2 + 3)
7 x 5 = (7 x 2) + (7 x 3)
7 x 5 = 14 + 21
7 x 5 = 35
True or False:
5 x 7 = 28
False
5 x 7 = 35
Yes or No: Does the following number sentence have the same value as 8 x 6? 8 + (4 x 2) = ___
No
Rue buys some ribbon and cuts it into 7 pieces that are the same length. Each piece is 9 inches long. How long was the ribbon that Rue bought?
63 inches
Tony and 3 friends divide some pennies evenly among themselves. Each friend separates his pennies into 3 equal stacks with 5 pennies in each stack.
Write a multiplication sentence that shows the total number of pennies. How many pennies are there in total?
Then, use the associative property of multiplication to create another multiplication sentence that shows the total number of pennies.
Example:
4 x (3 x 5) = 60
Associative property: (4 x 3) x 5 = 60
True or False:
8 x 7 = 49
False
8 x 7 = 56
Yes or No: Does the following number sentence have the same value as 8 x 6?
(8 x 4) + (8 x 2) = ___
Yes
Lincoln is making 4 first-aid kits. He wants to put 3 large and 4 small bandages in each kit. How many bandages does he need for the kits? Show your work.
28 bandages
Mrs. Wong-Weisel says, "I can find 8 x 9 by solving (8 x 6) x (8 x 3)." Does her statement make sense? Justify your answer.
No
If she multiplies (8 x 6) and (8 x 3) together, the product will be greater than 8 x 9. Instead, Mrs. Wong-Weisel should solve (8 x 6) + (8 x 3), which equals 72.
True or False:
9 x 7 = 63
True
Yes or No: Does the following number sentence have the same value as 8 x 6?
(6 x 4) + (6 x 2) = ___
No