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• Math: Introducing Unitizing and the Place Value System

# Math: Introducing Unitizing and the Place Value System

### Suggested Time Frame: 29 Instructional Days

##### Focus TEKS

Representing Two-Digit Numbers

• 1.2C  Use objects, pictures, and expanded and standard forms to represent numbers up to 120 [up to 99 in this unit]
• 1.2B  Use concrete and pictorial models to compose and decompose numbers up to 120 [up to 99 in this unit] in more than one way as so many hundreds, so many tens, and so many ones

Comparing Two-Digit Numbers

• 1.2E  Use place value to compare whole numbers up to 120 [up to 99 in this unit] using comparative language
• 1.2D  Generate a number that is greater than or less than a given whole number up to 120 [up to 99 in this unit]
• 1.5C  Use relationships to determine the number that is 10 more and 10 less than a given number up to 120 [up to 99 in this unit]
##### Numeracy TEKS

Skip Counting

• 1.4C  Use relationships to count  by twos, fives, and tens- to determine the value of a collection of pennies, nickels and/or dimes
• 1.4A  Identify U.S. coins including pennies, nickels, dimes and quarters by value and describe the relationships between them
• 1.4B Write a number with the cent symbol to describe the value of a coin
• 1.5B  Skip count by twos, fives, and tens to determine the total number of objects up to 120 [up to 99 in this unit] in a set;

Concept of Equality

• 1.5E  Understand that the equal sign represents a relationship where expressions on each side of the equal sign represent the same value(s)

• 1.3D  apply basic fact strategies to add and subtract within 20, including making 10 and decomposing a number leading to a 10; [Make Ten addition fact strategy in this unit]

##### Spiral Review TEKS

Addition and Subtraction [Solving, Explaining, and Representing]

• Solving
• 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 [Introduce CGI problem types JSU and SSU; include problems about data and length as well]
• Explaining
• 1.3E Explain strategies used to solve addition and subtraction problems up to 20 using spoken words, objects, pictorial models, and number sentences
• Representing
• 1.3F Generate and solve problem situations when given a number sentence involving addition or subtraction of numbers within 20
• 1.5D Represent word problems involving addition and subtraction of whole numbers up to 20 using concrete and pictorial models and number sentences

Counting Collections

• 1.5A Recite numbers forward and backward from any given number between 1 and 120;
• 1.5B  Skip count by twos, fives, and tens to determine the total number of objects up to 120 in a set