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.
Digit : A digit is a symbol used in the representation of a number.
Hundred : Hundred refers to the number 100.
Number : A number $x$ is a mathematical symbol representing a quantity.
How many of the numbers in 0,1,2,...,999 have a first digit equal to 1 or 9?
Sum : A sum is the result of an addition.
In a restaurant the guests can choose a main out of 4 pizzas and 3 pastas. How many main courses are there?
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?