1. Unit 3 (8.EE.3,4) Vocabulary

2. Significant Digits
each of the digits of a number used to express it to the required degree of accuracy, starting from the first nonzero digit.

3. Scientific Notation
a mathematical expression used to represent a decimal number between 1 and 10 multiplied by ten

4. Leading Digit
the leftmost digit : single, NON-ZERO number to the left of the decimal

5. Magnitude
The base of an exponent; all scientific notation numbers use a magnitude of 10

6. Order of Magnitude
The power of an exponent; the power of 10 for scientific notation