Answer all the questions below and press submit to see how many you got right.
Number : A number $x$ is a mathematical symbol representing a quantity.
What is 90:9?
Addition : Addition is the mathematical operation that describes increasing a number by an amount equal to a second number. The mathematical symbol for addition is the plus sign $+.$ The term addition is also used for a generalization of this basic operation on numbers to functions, vectors and matrices.
Multiple : A multiple of a number $x$ is any of the numbers $1x,2x,3x,4x,\ldots.$ For example the multiples of 7 include 7, 14, 21 and 70.
What is 5×0?
What is 30:6?