Answer all the questions below and press submit to see how many you got right.
Count : To count means to find out the number of objects by adding one for every object.
Divisible by 2 : An integer $x$ is called divisible by 2 if $x$ is a multiple of 2. An integer is divisible by 2 if and only if it is even.
Divisible by 3 : An integer $x$ is called divisible by 3 if $x$ is a multiple of 3. An integer is divisible by 3 if and only if the sum of its digits is divisible by 3.
Divisible by 6 : An integer $x$ is called divisible by 6 if $x$ is a multiple of 6. An integer is divisible by 6 if and only if it is even and the sum of its digits is divisible by 3.
Number : A number $x$ is a mathematical symbol representing a quantity.
Set : A set is a collection of objects.
Sum : A sum is the result of an addition.
In a set of 39 numbers 15 numbers are divisible by 2, 12 are divisible by 3 and 20 are neither divisible by 2 or by 3. How many numbers in the set are divisible by 6?
In a restaurant the guests can choose a main out of 4 pizzas and 5 pastas. How many main courses are there?
Multiplication : Multiplication is the mathematical operation that is a shorthand for adding the same amount several times. For example $3\cdot 4=4+4+4=12.$
In a special deal of a restaurant you can get a discount if you order a meal consisting out of one of 2 appetizers, one of 2 main courses and one of 5 deserts. How many different meals can you order?