Hexagon
A hexagon is a polygon with six sides and six angles. The sum of the interior angles of a hexagon is always 720 degrees.
Each side of a hexagon is of equal length, and each angle measures 120 degrees in a regular hexagon.
A regular hexagon has six lines of symmetry, meaning it can be divided into six equal parts by drawing lines from each vertex to the opposite vertex.
Some real-life examples of hexagons include the cells of a honeycomb, the shape of a stop sign, and the structure of some snowflakes.
In geometry, hexagons are used to create tessellations, which are a pattern of shapes that fit perfectly together without any gaps.
.◂Math Worksheets and Study Guides First Grade. Odd and Even
Study Guide
Odd and Even 
Worksheet/Answer key
Odd and Even Worksheet/Answer key
Odd and Even Worksheet/Answer key
Odd and Even Worksheet/Answer key
Identifying Even and Odd Numbers
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyThe resources above cover the following skills:
Number and Operations (NCTM)
Understand numbers, ways of representing numbers, relationships among numbers, and number systems.
Count with understanding and recognize 'how many' in sets of objects.
Develop a sense of whole numbers and represent and use them in flexible ways, including relating, composing, and decomposing numbers.
Connect number words and numerals to the quantities they represent, using various physical models and representations.
Grade 1 Curriculum Focal Points (NCTM)
Number and Operations: Developing an understanding of whole number relationships, including grouping in tens and ones
Children compare and order whole numbers (at least to 100) to develop an understanding of and solve problems involving the relative sizes of these numbers. They think of whole numbers between 10 and 100 in terms of groups of tens and ones (especially recognizing the numbers 11 to 19 as 1 group of ten and particular numbers of ones). They understand the sequential order of the counting numbers and their relative magnitudes and represent numbers on a number line.
Connections to the Grade 1 Focal Points (NCTM)
Algebra: Through identifying, describing, and applying number patterns and properties in developing strategies for basic facts, children learn about other properties of numbers and operations, such as odd and even (e.g., 'Even numbers of objects can be paired, with none left over'), and 0 as the identity element for addition.