Answer all the questions below and press submit to see how many you got right.
Negative : A number is negative if it is $\lt 0.$
Number : A number $x$ is a mathematical symbol representing a quantity.
Plus : Plus is either a symbol or another word for addition.
Zero : The number 0.
$-25+25=?$
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.
Follow from : A second equation or inequality follows from an initial equation or inequality if all solutions of the initial equation are also solutions from the second equation or inequality. It does not necessarily have to be the case that all solutions of the second equation or inequality have to by solutions of the first inequality. For example $x^2=1$ follows from $x=1$, but $x^2=1$ is not equivalent to $x=1$ as -1 is a solution of $x^2=1$ but not a solution of $x=1.$
Multiplication : Multiplication is the mathematical operation that is a shorthand for adding the same amount several times. For example $3\cdot 4=4+4+4=12.$
$-1\cdot 13=?$
Subtraction : Subtraction is the mathematical operation that describes decreasing a number by an amount equal to a second number. The mathematical symbol for subtraction is the minus sign $-.$ The term subtraction is also used for a generalization of this basic operation on numbers to functions, vectors and matrices.
$-55-(-55)=?$