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• Math: Revisiting Subtraction Concepts and Introducing the Use Doubles Addition Fact Strategy

# Math: Revisiting Subtraction Concepts and Introducing the Use Doubles Addition Fact Strategy

### Suggested Time Frame: 14 Instructional Days

##### Fluency TEKS

Subtraction – Concept

• 1.3B Use objects and pictorial models to solve word problems involving joining, separating, and comparing sets within 20 and unknowns as any one of the terms in the problem such as 2 + 4 =___; 3 +___= 7; and 5 =___– 3
• 1.3E Explain strategies used to solve addition and subtraction problems up to 20 using spoken words, objects, pictorial models, and number sentences
• 1.5D Represent word problems involving addition and subtraction of whole numbers up to 20 using concrete and pictorial models and number sentences

• 1.3D Apply basic fact strategies to add and subtract within 20, including making 10 and decomposing a number leading to a 10 [Use Doubles Addition Strategy in this unit]
• 1.2A  Recognize instantly the quantity of structured arrangements
• 1.5F Determine the unknown whole number in an addition or subtraction equation when the unknown may be any one of the three or four terms in the equation
• 1.5G Apply properties of operations to add and subtract two or three numbers

• 1.5D Represent word problems involving addition and subtraction of whole numbers up to 20 using concrete and pictorial models and number sentences
• 1.3E Explain strategies used to solve addition and subtraction problems up to 20 using spoken words, objects, pictorial models, and number sentences
##### Numeracy TEKS

• 1.3D Apply basic fact strategies to add and subtract within 20, including making 10 and decomposing a number leading to a 10 [Count On addition fact strategy in this unit]

Counting Patterns

• 1.5A Recite numbers forward and backward from any given number between 1 and 120 [100 in this unit]
##### Spiral Review TEKS

Kindergarten Geometry – 3-D Figures

• K.6E classify and sort a variety of regular and irregular two- and three-dimensional figures regardless of orientation or size
• K.6B identify three-dimensional solids, including cylinders, cones, spheres, and cubes, in the real world
• K.6C  identify two-dimensional components of three-dimensional objects

Kindergarten Geometry – 2-D Figures

• K.6E classify and sort a variety of regular and irregular two- and three-dimensional figures regardless of orientation or size
• K.6A identify two-dimensional shapes, including circles, triangles, rectangles, and squares as special rectangles
• K.6D identify attributes of two-dimensional shapes using informal and formal geometric language interchangeably
• K.6F create two-dimensional shapes using a variety of materials and drawings

Counting Collections

• 1.5A Apply number patterns within properties of numbers and operations in order to describe relationships. Recite numbers forward and backward from any given number between 1 and 120 [100 in this unit]