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Math: Continuing 2-Digit Addition and Subtraction Strategies

Suggested Time Frame: 20 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
    • 2.2A use concrete and pictorial models to compose and decompose numbers up to 1,200 [100 in this unit] 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
    • 2.4A recall basic facts to add and subtract within 20 with automaticity
    • 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 [100 in this unit]
    • 2.9C represent whole numbers as distances from any given location on a number line

Problem Solving

  • 2.4C solve one-step and multi-step word problems involving addition and subtraction within 1,000 [100 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 [100 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
Computational Fluency TEKS

Subtraction Fact Strategies

  • 2.4A recall basic facts to add and subtract within 20 with automaticity [Use Doubles and Make Ten strategies in this unit]

1st Grade Skip Counting

  • 1.5B skip count by twos, fives, and tens to determine the total number of objects up to 120 in a set; [starting at 0 and from other numbers]
Spiral Review TEKS

Measure Time

  • 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.

1st Grade Geometry Concepts

  • 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