A way of writing numbers in which the numbers are written to show the place value of each digit (639 = 600 + 30 + 9)

Pairs of numbers that when multiplied together equal 1., They are also called multiplicative inverses of each other.

A ratio that compares a number to 100

The greatest number that is a factor of each of two or more numbers.

A tool used to measure angles

the smallest multiple that is exactly divisible by every member of a set of numbers

a number or quantity that when multiplied with another produces a given number or expression

Of any counting number are the results of multiplying that continues number by all the counting numbers. Ex: 7: 7,14, 21,28....

A point where two or more straight lines meet.

A flat surface on which a straight line joining any two points would wholly lie.

Changing the grouping of numbers will NOT change the value. For example: (7 + 4) + 8 = 7 + (4 + 8) also works with multiplication

In mult or add, the order of two numbers may be switched around and the answer is the same. Ex: a+b = b+a.

a + 0 = a

A whole number that has exactly two factors, 1 and itself.

A point where two or more straight lines meet.