Properties of Multiplication
What property of multiplication tells us that when we multiply any number times 0, the answer is always 0?
Zero Property of Multiplication
What is the missing symbol?
8 x 9 ____ 9 x 8
8 x 9 = 9 x 8
There are 5 cars on the monorail. Each car has 6 rows of seats and 4 can sit in each row. How many people can ride on the monorail?
120 people
What list correctly shows ALL of the factors of 20.
A: 1, 4, 5, 10, 20
B: 1, 4, 20
C: 20, 40, 60, 80
D: 1, 2, 4, 5, 10, 20
Answer: D
Stacie ran 3 miles. Eduardo ran 3 times as many miles as Stacie. Is it reasonable to say that Eduardo ran around 10 miles?
3 x 3 = x miles
x = 9 miles
Yes, it is reasonable to say that Eduardo ran around 10 miles.
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What is the missing symbol?
8 ____ 8 = 0
8 - 8 = 0
Sarah has gymnastics practice 5 days each week. Her sister practices 3 fewer days each week. Write an equation to tell how many days her sister has practice.
5 - 3 = x
Sarah's sister has 2 days of practice each week.
Which list contains ONLY multiples of 6?
A. 1, 2, 3, 6
B. 12, 30, 41, 60
C. 18, 24, 36, 42, 66
D. 12, 17, 24, 30
Answer: C
On Monday, Libby counted 8 frogs in a pond. Evan counted twice as many on Wednesday. Is it reasonable to say that Evan counted close to 25 frogs on Wednesday?
8 x 2 = 16 frogs
No, it is not reasonable to say Evan counted close to 25 frogs on Wednesday.
Mentally Multiply: 7 x 5 x 2
Answer: 70
What is the missing symbol?
8 ____ 8 = 1
8 / 8 = 1
Sam has 5 Pokemon cards. Jake has 4 times as many Pokemon cards as Sam. How many Pokemon cards does Jake have?
4 x 5 = P
Jake has 20 Pokemon cards.
Which of the following is true?
A. 14 is a factor of 7
B. 32 is a multiple of 2, 4, and 9
C. The number 5 has 4 factors: 1, 2, 3, & 5
D. 27 is a multiple of 3 and 9
Answer: D
At the dog shelter, Bridget walked 156 dogs in the month of April. In May, she walked 198 dogs. Is it reasonable to say that Bridget walked ABOUT 500 dogs in two months?
"about" tells me to round
Original Problem: 156 + 198 = x
After rounding: 200 + 200 = x
x = 400 dogs.
Answer: No, it is not reasonable.
What property of multiplication can help you mentally multiply 3 numbers together?
The Associative Property of Multiplication
What is the missing symbol?
5 x 2 x 4 _____ 7 x 6
Less than symbol
5 x 2 x 4 < 7 x 6
Jeff has 56 Skittles. This is 8 times the number of Skittles that Drew has. How many Skittles does Drew have?
Jeff has 56 Skittles. This is 8 times the number of Skittles that Drew has. How many Skittles does Drew have?
Answer: 56 = 8 x S
Drew has 7 Skittles
Can you list all the multiples of a number?Explain why or why not.
No, it is impossible to list all the multiples of a number. It is impossible to do this because numbers go on forever, so therefore so do multiples.
Megan and 2 friends collected magazines. Is it reasonable to say that they collected a total of 20 magazines?
Magazines Collected:
Megan- 10 magazines
Carl- 6 magazines
Bruce- twice as many as Carl
Magazines Collected:
Megan- 10 magazines
Carl- 6 magazines
Bruce- 2 x 6 = 12 magazines
10 + 6 + 12 = 28 magazines
No, it is not reasonable to say they collected a total of 20 magazines.
Your friend is having trouble with the fact 6 x 5, but he knows 5 x 6. What property of multiplication tells us that if we know 6 x 5 we should also know 5 x 6?
The Commutative Property of Multiplication
What is the missing symbol?
2 x 2 x 10 _____ 4 x 6 x 2
Less than symbol
4 x 2 x 5 < 4 x 6 x 2
Gwen practiced piano the past two weekends. Last weekend, she played for 10 minutes. This weekend, she played for 50 minutes. Write a multiplication comparison comparing the amount of minutes she played last weekend and this weekend.
Gwen practice the piano 5 times more this weekend than she did last weekend.
(5 x 10 = 50 minutes)
Find all the factors of 24.
The factors of 24:
1, 2, 3, 4, 6, 8, 12, 24
Three sisters are saving their money to buy a video game. The system costs $359.99. Janelle has saved $93. June has saved $143. Jackie has saved $79. Is it reasonable to say they need about $50 more to buy the system?
"about" tells us to round!
Original problem: $93 + $143 + $79 + M = $359.99
After rounding: $90 + $140 + $80 + M = $360
$310 + M = $360
Yes, it would be reasonable to say they need about $50 more to buy the system.