This document defines key terms used in decimal math including place value, decimal numbers, tenths, hundredths, thousandths, decimal point, whole numbers, rounding, estimation, comparing, ordering, and scientific notation. It provides examples for each term to illustrate its meaning in decimal math. Key concepts covered are that decimals represent numbers between whole numbers, place value determines the value of each digit, and rounding, estimating, comparing, and ordering are methods used to work with decimal numbers.

1. VOCABULARY
Decimal Numbers

2. Decimal Math Vocabulary
Place Value: The multiple of ten telling how
much a digit represents.
Example: in 374, the 7 is in the tens place.
Decimal: A number that can represent a whole
number and numbers between whole numbers.
Example: 4.5 is between 4.0 and 5.0
Tenths: The first decimal place to the right of
the decimal point; 1 of 10 equal
parts. Example: .7

3. Hundredths: The second decimal place to the right
of the decimal point; 1 of 100 equal
parts. Example: .8 7
Thousandths: The third decimal place to the right of
the decimal point; 1 of 100 equal
parts. Example: .6 4 3
Decimal Point: A period separating the ones and
tenths in a decimal number.
Example: 7.4
Whole Numbers: The set of all counting numbers
and 0. Example: 296

4. Rounding: Is a method of finding an estimate that’s the closest to a
given place value.
Example: 1.37 Rounded to the nearest tenths place would
equal 1.4
Estimation: An approximation for the result of a calculation.
Comparing: Less Than, Greater Than, or Equal.
Example: 4.256 ‹ 4.276
Ordering: Ranking numbers from least to greatest or greatest to
least.
Example: 1.2; 4.3; 3.1, 1.6 Answer: 1.2; 1.6, 3.1, 4.3
Scientific Notation: Writing a number as the product of a number
greater than or equal to 1 but less than 10 and a power of 10.
Example: 350 = 3.5 x 10^2