Mary was skip counting with a friend during recess. Mary started to count by 12's. She said 12, 24, 36. What two numbers will she say next?
She will say 48 and 60.
100
Use the divisibility rule for 2.
Is 86 divisible by 2? Explain your answer.
Yes, because 86 is an even number.
100
What are the prime numbers between 10 and 20?
11, 13, 17, 19
100
Look carefully at the number pattern. 14, 17, 16, 19, 18, What rule does this pattern follow?
Rule: Add 3, Subtract 1
200
List the factors of 24 and 36.
Then, circle the common factors.
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36
The common factors are 1, 2, 3, 4, 6, 12.
200
Which number is a multiple of 12 and 36?
A) 12
B) 24
C) 36
36 is a multiple of 12 and 36.
200
Use the divisibility rule for 5. Name three numbers that are divisible by 5.
5, 10, 15, 20, 25 ... Any number with 0 or 5 in the ones place.
200
Can a composite number be an odd number? Explain your answer.
Yes, some examples are 9, 15, and 25.
200
Look carefully at this pattern. 70,67,71,68,72,69...
Rule: Subtract 3, Add 4
300
There are 12 boys and 18 girls in Ms. Ruiz’s science class. Each lab group must have the same number of boys and the same number of girls. What is the greatest number of groups Ms. Ruiz can make if every student must be in a group?
Factors of 12: 1, 2, 3, 4, 6, 12
Factors of 18: 1, 2, 3, 6, 9, 18
The Greatest Common Factor of 12 and 18 is 6. The greatest number of groups Ms. Ruiz can make is 6.
300
What is the least common multiple of 4 and 6?
The least common multiple is 12.
300
Use the divisibility rule for 3. Is 96 divisible by 3? Explain your answer.
Yes. First add the digits. 9 + 6 = 15 Then divide by 3.
300
Is 2 a prime number or a composite number? Explain your answer.
2 is a prime number. Prime numbers only have one pair, 1 and itself as factors.
300
Look carefully at the number pattern.
27, 35, 33, 41, 39, 47 ...
What rule does this pattern follow?
Rule: Add 8, Subtract 2
400
Peter has 18 oranges, 27 pears, and 12 bananas. He wants to make fruit baskets with the same number of each fruit in each basket. How many of each type of fruit will be in the baskets?
18: 1, 2, 3, 6, 9, 18
27: 1, 3, 9, 27
12: 1, 2, 3, 4, 6, 12
There will be 3 of each fruit in a basket.
400
Eggs come in packages of 12 and English muffins come in packages of 10. What is the least number of packages of each that can be bought to be able to make egg sandwiches with no muffins or eggs left over?
The Least Common Multiple for the two numbers is 60. You would have to buy 5 cartons of eggs and 6 packages of muffins. (Look at the factors - 12 x 5 is 60 and 10 x 6 is 60).
400
Grace has three apple trees in her back yard. The first tree has 66 apples on it, the second has 42 apples, and the third has 12 apples. When she picks the apples she puts them in boxes of 24. How many boxes will she need?
She will need 5 boxes.
400
Lisa thinks that 57 and 67 are both prime because they both have a 7 in the ones place. Is she correct? Explain your answer.
57 is not a prime number. 1, 3, 19, 57
400
Look carefully at the pattern. 80, 72, 64, 56, 48, 40... What are the next three numbers in this pattern?
32, 24, 16
500
Ella is making treat bags for her friends. She bought 20 stickers. List all the different ways Ella can make
treat bags if each treat bag has the same amount of stickers inside?
There are 6 different ways. 1 x 20, 2 x 10, 4 x 5, 5 x 4, 10 x 2, 20 x 1
500
Carl has a soccer game every 4th day, Matt has one every 5th day. When will they have a game on the same day?
The Least Common Multiple is 20, so they will both have a game on the 20th day.
500
Tony is going to the store to buy hamburgers and buns for his food truck. He buys 124 hamburgers. Hamburger buns come in packages of 8. How many packages of buns will he need to buy to make sure he has enough for all of his hamburgers?
The answer when you divide is 15 R 4. However, he needs 16 packages of hamburger buns.
500
List 2 prime numbers between 50 and 80.
Possible answers are 51, 53, 59, 61, 67, 71, 73, and 79.