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 7?
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.
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 9?
Divisible by 8 : An integer $x$ is called divisible by 8 if $x$ is a multiple of 8. An integer is divisible by 8 if and only if the last three digits form a number that is divisible by 8.
How many of the numbers in 1,2,3,...,69 are not divisible by 8?