equivalent expressions: mathematical statements that may look different but are equal. For example, 6 x 26= 6 x (25 +1)
exponent: a number or symbol that indicates the power to which the base number is raised. The exponent of a number says how many times to use that number in a multiplication. It is written as a small number to the right and above the base number.
expression: one or more mathematical symbols that represent a number or quantity; expressions do not include equality or inequality signs. For example, 5 x 25.
pattern: a collection of numbers, shapes, or objects that forms a consistent or characteristic arrangement
powers of 10: "Powers of 10" is a very useful way of writing down large or small numbers. Instead of having several zeros, you show how many powers of 10 will make that many zeros.