# Math: Geometry, Area, and Perimeter

### Suggested Time Frame: 24 Instructional Days

##### Focus TEKS

Geometry

• 3.6A classify and sort two- and three-dimensional figures, including cones, cylinders, spheres, triangular and rectangular prisms, and cubes, based on attributes using formal geometric language; – R RC3
• 3.6B use attributes to recognize rhombuses, parallelograms, trapezoids, rectangles, and squares as examples of quadrilaterals and draw examples of quadrilaterals that do not belong to any of these subcategories; – S RC3

Measure Area

• 3.6C determine the area of rectangles with whole number side lengths in problems using multiplication related to the number of rows times the number of unit squares in each row; – R RC3
• 3.6D decompose composite figures formed by rectangles into non-overlapping rectangles to determine the area of the original figure using the additive property of area; and – S RC3

Measure Perimeter

• 3.7B determine the perimeter of a polygon or a missing length when given perimeter and remaining side lengths in problems; – R RC3
• 2.9D determine the length of an object to the nearest marked unit using rulers, yardsticks, meter sticks, or measuring tapes
##### Numeracy TEKS

Building Fluency with Addition and Subtraction of 2-Digit Numbers (Suggested: 17 days)

• 3.4A solve with fluency one-step and two-step problems involving addition and subtraction within 1,000 using strategies based on place value, properties of operations, and the relationship between addition and subtraction; – R RC2
• 3.4B round to the nearest 10 or 100 or use compatible numbers to estimate solutions to addition and subtraction problems; – S RC2

Counting Patterns (Suggested: 5 days)

• RRISD 3.3 skip count by fractions starting at 0 and describe patterns observed while counting [Skip count by halves, thirds, fourths, sixths, and eighths in this unit.]
##### Spiral Review TEKS

Grade 2 Place Value Concepts (Suggested: 14 days)

• Representing Numbers up to 1,200
• 2.2B use standard, word, and expanded forms to represent numbers up to 1,200
• 2.2A use concrete and pictorial models to compose and decompose numbers up to 1,200 in more than one way as a sum of so many thousands, hundreds, tens, and ones
• 2.2E locate the position of a given whole number on an open number line
• 2.2F name the whole number that corresponds to a specific point on a number line
• 2.7B use an understanding of place value to determine the number that is 10 or 100 more or less than a given number up to 1,200
• Comparing Numbers up to 1,200
• 2.2D use place value to compare and order whole numbers up to 1,200 using comparative language, numbers, and symbols (>, <, or =)
• 2.2C generate a number that is greater than or less than a given whole number up to 1,200

Grade 2 Data Analysis (Suggested: 8 days)

• 2.10C write and solve one-step word problems involving addition or subtraction using data represented within pictographs and bar graphs with intervals of one
• 2.10A explain that the length of a bar in a bar graph or the number of pictures in a pictograph represents the number of data points for a given category
• 2.10B organize a collection of data with up to four categories using pictographs and bar graphs with intervals of one or more
• 2.10D draw conclusions and make predictions from information in a graph

Counting Quantities (Suggested: 2 days, using both numeracy and spiral review time)

• RRISD 3.1 Organize and count a collection of objects and create a recording of how the objects were counted
• 3.1C  select tools, including real objects, manipulatives, paper and pencil, and technology as appropriate, and techniques, including mental math, estimation, and number sense as appropriate, to solve problems;
• 3.1E  create and use representations to organize, record, and communicate mathematical ideas;
• Counting Coins (Make this the focus on 1 day of Counting Collections)

• 2.5A determine the value of a collection of coins up to one dollar [pennies, nickels, dimes, and quarters]
• 2.5B use the cent symbol, dollar sign, and the decimal point to name the value of a collection of coins

Telling Time (Ongoing)

• 2.9G read and write time to the nearest one-minute increment using analog and digital clocks and distinguish between a.m. and p.m.