ILC 1st Grade Mathematics: Unit 3 Adding and Subtracting Within 20

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Course Repository

Grade Level

Course Format

Unit

License

CC BY

Course Description

This is unit 3 of 8 units. The sequence of units is available in the Read Me First Materials in each unit.

Section A: Develop Fluency with Addition and Subtraction to 10
In this section, students focus on developing fluency with addition and subtraction within 10.
Section B: Use the Structure of 10 to Add and Subtract
In this section, students explore the base-ten system and place value as they learn that ten ones are put together to make a new unit, a ten.
Section C: Add within 20
In this section, students add 2 or 3 numbers with a total within 20. Students find the sum of 2 addends using methods where they count on or use related facts they know.
Section D: Subtract within 20
In this section, students subtract within 20. They use the relationship between addition and subtraction and their understanding of the usefulness of a ten.

Standards

These instructional materials are available to assist educators in implementing Iowa’s Academic Standards. Curriculum leaders and teachers should review these instructional materials to ensure full implementation of Iowa’s Academic Standards in the local curriculum. Each module identifies standards that are addressed and assessed.

Prerequisites

None

SCED Code

Source Name

Illustrative Mathematics. (2021). K-5 Math version. Kendall Hunt Publishing. https://im.kendallhunt.com/k5/curriculum.html.

Lead developer

Cassidy Schmell

Course Updates