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• Math: Continuing to Develop 2-Digit Addition and Subtraction Strategies

# Math: Continuing to Develop 2-Digit Addition and Subtraction Strategies

### Suggested Time Frame: 19 Instructional Days

##### Focus TEKS

Computation

• 2.4B add up to four two-digit numbers and subtract two-digit numbers using mental strategies and algorithms based on knowledge of place value and properties of operations

Problem Solving

• 2.4C solve one-step and multi-step word problems involving addition and subtraction within 1,000 [120 in this unit] using a variety of strategies based on place value, including algorithms
• 2.4D generate and solve problem situations for a given mathematical number sentence involving addition and subtraction of whole numbers within 1,000 [120 in this unit]

Representing

• 2.7C represent and solve addition and subtraction word problems where unknowns may be any one of the terms in the problem
##### Numeracy TEKS

Counting Patterns (Suggested: 4 days)

• 2.5A determine the value of a collection of coins up to one dollar [pennies, nickels, and dimes only in this unit]
• 2.5B use the cent symbol, dollar sign, and the decimal point to name the value of a collection of coins
• RRISD 2.7B Skip count forward and backward by ten and one hundred from any given number up to 1,000

Building Fluency with Addition and Subtraction within 20 (Suggested: 12 days)

• 2.4A recall basic facts to add and subtract within 20 with automaticity
##### Spiral Review TEKS

1st Grade Revisiting Shapes and Fair Shares (Suggested: 16 days)

• 1.6A  Classify and sort regular and irregular two-dimensional shapes based on attributes using informal geometric language
• 1.6B Distinguish between attributes that define a two-dimensional or three-dimensional figure and attributes that do not define the shape
• 1.6C  Create two-dimensional figures, including circles, triangles, rectangles, and squares as special rectangles, rhombuses, and hexagons
• 1.6D Identify two-dimensional shapes, including circles, triangles, rectangles, and squares as special rectangles, rhombuses, and hexagons, and describe their attributes using formal geometric language
• 1.6E Identify three-dimensional solids, including spheres, cones, cylinders, rectangular prisms [including cubes], and triangular prisms, and describe their attributes using formal geometric language
• 1.6F  Compose two-dimensional shapes by joining two, three, or four figures to produce a target shape in more than one way if possible
• 1.6G  Partition two-dimensional figures into two and four fair shares or equal parts and describe the parts using words
• 1.6H  Identify examples and non-examples of halves and fourths

Counting Quantities (Suggested: 3 days, using both numeracy and spiral review time)

• RRISD 2.1 organize and count a collection of objects and create a recording of how the objects were counted
• 2.1C  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;
• 2.1E  create and use representations to organize, record, and communicate mathematical ideas;

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.