Multiples
Name the first five multiples of 2:
2, 4, 6, 8, 10
True or False:
54 has more than two factors
True
29? Explain
Prime. 1, 29
Jayme wants to buy new headphones. The headphones cost $34. If she saves $5 each week, how many weeks will it take her to have enough money to buy the headphones?
7 weeks
Robert wants to go on a trip with his friend. He needs to save up $105 to be able to go. If he saves $10 each week, how many weeks will he need to save to have enough money for the trip?
11 weeks
Name the first five multiples of 3
3, 6, 9, 12, 15
Which lists all the factors of 36 and are also composite numbers?
A - 1, 36
B - 1, 2, 4, 6, 36
C- 4, 6, 9, 12, 18, 36
C
64? Explain.
Composite: 1, 2, 4, 8, 16, 32, 64
Javier says all odd numbers greater than 2 and less than 20 are prime. True or false? Explain.
False: 9, 15 are not prime
9= 1, 3, 9
15= 1, 3, 5, 15
Jared says all even numbers less than 20 are composite. True or False? Explain.
False: 3, 7, 11, 13, 17, and 19 are all prime
3= 1, 3
7= 1, 7
11= 1, 11
13= 1, 13
17= 1, 17
19= 1, 19
Find the first 3 multiples of 12:
12, 24, 36
How many factors are there for 64?
7 Factors (1, 2, 4, 8, 16, 32, 64)
59? Explain.
Prime: 1, 51
Courtney has 36 photos to arrange on a gallery wall. How many arrays can Courtney make with the 36 photos? List all possibilities.
1, 2, 3, 4, 6, 9, 12, 18, 36
Margie has 64 rectangular steppingstones to arrange in an array in her backyard. How many arrays can Margie make with the 64 steppingstones? List all the possibilities.
1, 2, 4, 8, 16, 64
Name the first 5 multiples of 12
12, 24, 36, 48, 60
How many factors for 36?
Bonus (+100): How are factors of 36 similar to multiples of 36?
9 Factors (1, 2, 3, 4, 6, 9, 12, 18, 36)
Bonus (+100): All the factors of 36 will also have 36 as a multiple.
True or False:
The only factors of 16 are 16 and 1; therefore, 16 is prime.
False: 1, 2, 4, 8, 16
Carter lives on a street where all the house numbers are multiples of 6. Name two possible house numbers between 70 and 80. Explain
72, 78
(6 x 12) = 72
(6 x 13) = 78
Pete's Pastries sells cupcakes in packs of 4. A caterer needs between 42 and 50 cupcakes for dessert. Name two possible numbers between 42 and 50 that are multiples of 4. Explain.
44 and 48
(4 x 11) = 44
(4 x 12) = 48
Name the first 5 ODD multiples of 9
9, 27, 45, 63, 81
Write the factors of 42 that are also prime numbers.
PRIME factors: 3, 7
(Factors: 1, 2, 3, 6, 7, 14, 21, 42)
True or False:
The only factors of 31 are 31 and 1; therefore, 31 is composite.
False: It is a prime (1,31)
A store manager wants to display 45 cans of soup in an array. What are the different ways he can display the soup?
5x9, 3x15, 9x1 (3 ways)
Mrs. Fisher has 91 watches on display at her store. She says she can arrange them into rows and columns without any watches left over. Mr. Fisher says she can only make 1 row with all 91 watches. Who is correct? Explain.
Mrs. Fisher: 1x91, 91x1, 7x13, 13x7