Dividing Whole Numbers
A store has 64 toys and wants to divide them equally among 8 children. How many toys will each child get?
Each child will get 8 toys.
A recipe calls for 0.3 teaspoons of vanilla extract. If you only have 0.1 teaspoons of vanilla extract, how many times do you need to divide it to get the required amount?
3
Which of the following numbers is divisible by both 2 and 3?
a) 18 b) 27 c) 36 d) 45
a) 18
In a particular art class, there are a total of 7 students. Can the teacher make groups of students so that every group will have the same number of students? If No, why?
No, groups cannot be formed as 7 is a prime number.
1) ___________ are the number that are multiplied to get a number (or product).
2) ___________ are the numbers we get when we multiply or count by a certain number.
1) Factors
2) Multiples
A school has 180 books and wants to divide them equally among 6 classrooms. How many books will be in each classroom?
There will be 30 books in each classroom.
A field is 2,625 square feet in area. If each plot of land is 25 square feet, how many plots can be made from the field?
105 plots can be made.
Is 432 divisible by 3?
The sum of the digits of 432 is 4 + 3 + 2 = 9. Since 9 is divisible by 3, we can conclude that 432 is also divisible by 3.
List all the factors of 23 and conclude whether it is prime or composite.
1 and 23, 23 is a prime number
Which of these numbers are factor pairs of 26?
A) 1 and 25
B) 1 and 26
C) 2 and 13
D) 4 and 7
B and D
A factory produces 1,200 widgets in a day. If the widgets are packed into boxes containing 50 widgets each, how many boxes are needed?
24 boxes are needed.
Find the quotient. Round to 3 digits if necessary.
608 ÷ 3 = ?
202.667
Is 12,345 divisible by 9?
The sum of the digits of 12,345 is 1 + 2 + 3 + 4 + 5 = 15. Since 15 is divisible by 9, we can conclude that 12,345 is divisible by 9.
Fill in the blanks:
a) The smallest prime number is ____.
b) ___ is the prime number nearest to 90.
2, 89
Which groups of numbers below are multiples of 3?
A) 35, 32, 38, 30
B) 24, 15, 30, 9
C) 13, 43, 23, 53
D) 27, 36, 9, 18
Groups B and D
During a normal day, there are 280 planes taking off from the airport, but the airport is a lot busier during Christmas. During the Christmas holidays, about 336 planes take off every day from the airport. During the Christmas holidays, the airport opens 12 hours during each day, how many planes take off from this airport in each hour?
336 ÷ 12 = 28
28 planes take off from this airport each hour during the Christmas holidays.
Find the quotient. Round to 3 digits if necessary.
15,869 ÷ 25 = ?
634.76
Is 9,876 divisible by 7?
No, 9,876 is not divisible by 7.
I am a number between 50 and 100. My ones digit is two less than my tens digit. I am a prime number. What number am I?
53
Give two numbers that are multiples of 7 and 3 that are less than 50.
21 and 42
A stadium has 10,500 seats and 8 VIP boxes. The stadium is divided into 12 equal sections: 2 premium sections and 10 standard sections. A seat at the premium section costs $48 per game. A seat at the standard section costs $27 per game. How many seats are there in each section?
10,500 ÷ 12 = 875
There are 875 seats in each section.
Find the quotient. Round to 3 digits if necessary.
73,920 ÷ 24 = ?
3,080
Which of the following numbers is not divisible by 8?
a) 316 b) 320 c) 408 d) 512
a) 316
Make a list of all the composite numbers from 50 to 70.
50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70
Write down the first 6 multiples of 18.
18, 36, 54, 72, 90, 108