Answer all the questions below and press submit to see how many you got right.
Digit : A digit is a symbol used in the representation of a number.
Number : A number $x$ is a mathematical symbol representing a quantity.
Thousand : Thousand refers to the number $1,000=10^3.$
How many of the numbers in 0,1,2,...,999 have at least one digit equal to 9?
Even : Even can refer either to an even function or an even number.
Even number : A number is called even if it is divisible by 2. A number is even if and only if it ends in 0, 2, 6 or 8.
Hundred : Hundred refers to the number 100.
One-digit number : A one-digit number is a number with one digit. A one-digit number is between 0 and 9.
Ones digit : The first digit left of the decimal point (or the digit furthest to the right if there is no decimal point). It counts multiples of 1.
Tens digit : The tens digit is the second digit left of the decimal point. For example 31.2 and 32 both have tens digits equal to 3.
Two-digit number : A two-digit number is a natural number between 10 and 99.
How many different even numbers smaller than 100 only contain digits between 1 and 5?
Sum : A sum is the result of an addition.
In a restaurant the guests can choose a main out of 10 pizzas and 4 pastas. How many main courses are there?