# Math: Introducing Subtraction within 10

### Suggested Time Frame: 19 Instructional Days

##### Focus TEKS

Composing and Decomposing within 10

• K.2I compose and decompose numbers up to 10 with objects and pictures

Developing the Concept of Subtraction

• K.3B solve word problems using objects and drawings to find sums up to 10 and differences within 10
• K.3A model the action of joining to represent addition and the action of separating to represent subtraction
• K.3C explain the strategies used to solve problems involving adding and subtracting within 10 using spoken words, concrete and pictorial models, and number sentences
##### Computational Fluency TEKS

Number Sense

• K.2D recognize instantly the quantity of a small group of objects [up to 10] in organized and random arrangements

Counting Patterns

• K.5 The student is expected to recite numbers up to at least 100 [60 in this unit] by ones and tens beginning with any given number
##### Spiral Review TEKS

Counting Collections

• K.5 The student is expected to recite numbers up to at least 100 [60 in this unit] by ones and tens beginning with any given number [beginning with 1 in this unit]

Comparing Quantities

• K.2H use comparative language to describe two numbers up to 20 [10 in this unit] presented as written numeral
• K.2E generate a set using concrete and pictorial models that represents a number that is more than, less than, and equal to a given number up to 20 [10 in this unit]
• K.2F generate a number that is one more than or one less than another number up to at least 20 [10 in this unit]
• K.2G compare sets of objects up to at least 20 [10 in this unit] in each set using comparative language

Measurable Attributes

• K.7B compare two objects with a common measurable attribute to see which object has more of/less of the attribute and describe the difference
• K.7A give an example of a measurable attribute of a given object, including length, capacity, and weight