Compare numbers, to consider the value of two numbers to determine which number is greater or less or if the numbers are equal in value, Compose numbers, to combine parts or smaller values to form a number, Counting (natural) numbers, the set of positive numbers that begins at one and increases by increments of one each time {1, 2, 3, ..., n}, Decompose numbers, to break a number into parts or smaller values, Digi, any numeral from 0 – 9, Expanded form, the representation of a number as a sum of place values (e.g., 56,789 as 50,000 + 6,000 + 700 + 80 + 9), Expanded notation, the representation of a number as a sum of place values where each term is shown as a digit(s) times its place value (e.g., 56,789 as (5 × 10,000) + (6 × 1,000) + (7 × 100) + (8 × 10) + (9 × 1)), Numeral, a symbol used to name a number, Open number line, an empty number line where tick marks are added to represent landmarks of numbers, often indicated with arcs above the number line (referred to as jumps) demonstrating approximate proportional distances, Order numbers, to arrange a set of numbers based on their numerical value, Period, a three-digit grouping of whole numbers where each grouping is composed of a ones place, a tens place, and a hundreds place, and each grouping is separated by a comma, Place value, the value of a digit as determined by its location in a number such as ones, tens, hundreds, one thousands, ten thousands, etc., Standard form, the representation of a number using digits (e.g., 56,789), Whole numbers, the set of counting (natural) numbers and zero {0, 1, 2, 3, ..., n}, Word form, the representation of a number using written words (e.g., 56,789 as fifty-six thousand, seven hundred eighty-nine)

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