 Unit 4

Place Value, Comparison, Addition and Subtraction to 40

Math

Description: Students build understanding of place value. Addition and subtraction within 40 rest primarily on establishing a “ten” as a unit that can be counted. Students begin to see a problem like 23 + 6 as an opportunity separate the “2 tens” in 23 and concentrate on the familiar addition problem 3 + 6. Adding 8 + 5 is related to solving 28 + 5; complete a unit of ten and add 3 more.

Louisiana Student Standards for Mathematics (LSSM)

Instructional Outcomes

Enduring Understandings:

·         Students will solve various types of addition and subtraction word problems and equations using strategies.

·         Students will use place value to compare two numbers.

·         Students will add two-digit and one-digit numbers with and without composing a group of ten.

·         Students will develop strategies for adding and subtraction whole numbers.

·         Students will understand that addition and subtraction are processes in which groups are joined and separated.

Essential Questions:

·         What happens when we join two quantities or take one from another?

·         How can we find the total when we join two quantities?

·         How can we find what is left when we take one quantity from another?

·         How can we find the difference when we compare one quantity to another?

·         How can we compare one quantity to another?

·         How can we represent problem situations?

·         How can we show that addition and subtraction are related?