Unit 2

Introduction to Place Value Through Addition and Subtraction Within 20

Math

Description: Students add and subtract within 20. Students model adding and subtracting across ten in word problems and with equations. In Unit 1, students grouped 10 objects to make a ten. In unit 2 students transition to conceptualizing that ten as a single unit (using 10 linking cubes stuck together, for example). This is a major stepping-stone in understanding place value, learning to group 10 ones as a single unit: 1 ten.

Louisiana Student Standards for Mathematics (LSSM)

Instructional Outcomes

Enduring Understandings:

·         Students will understand the relationship between addition and subtraction.

·         Students will understand the part and whole relationships within numbers.

·         Students will compose and decompose the numbers 1 to 10.

·         Students can solve various types of word problems using objects, drawings, and symbols.

·         Students will develop fact fluency for addition and subtraction within 10.

Essential Questions:

·         How do we show that numbers work together?

·         How can we show and explain our thinking?

·         How does understanding numbers help me?

·         How do drawing pictures and words help me understand numbers?

·         How can a problem be solved in different way?