ILC 1st Grade Mathematics: Unit 5 Adding Within 100

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Course Repository

Grade Level

Course Format

Unit

License

CC BY

Course Description

This is unit 5 of 8 units. The sequence of units is available in the Read Me First Materials in each unit.

Section A: Adding Without Making a Ten
In this section, students add a two-digit number and a one- or two-digit number without composing a ten.
Section B: Make a Ten
In this section, students learn that sometimes when adding two-digit numbers within 100, it is necessary to compose a ten from ones. They draw on the idea of making a ten.
Section C: Make a Ten: Adding Within 100
In this section, students apply what they learned about adding one- and two-digit numbers to add any numbers within 100—with and without composing a ten. They apply the associative and commutative properties as they count on, add tens and tens, and add ones and ones.

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

Roberta Huju

Course Updates