Count : To count means to find out the number of objects by adding one for every object.

Number : A number $x$ is a mathematical symbol representing a quantity.

Digit : A digit is a symbol used in the representation of a number.

Divisible : An integer $x$ is called divisible by an integer $y$ if the division $x:y$ has a remainder of zero. For example 4 is divisible by 2 but 5 is not divisible by 2.

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.

Number : A number $x$ is a mathematical symbol representing a quantity.

Distributive property : The distributive property is defined by $a(x+y)=ax+ay$ for all $a,x,y.$ The distributive property is implicitly used whenever one multiplies out brackets or uses standard algorithms for multiplication or division.

Equation : An equation is a mathematical statement in which two expressions are written with an equal sign in between. A solution of an equation is a set of variables that makes the statement a true statement.

Solution : A solution to an equation is a choice of variables that when substituted into the equation results in a true statement.