Lesson 8

Assessing the Subtraction Facts

Est. Class Sessions: 1
X

Mathematical Standards

3.NBT.A
Use place value understanding and properties of operations to perform multi-digit arithmetic. (3.NBT.A.2)

Standards for Mathematical Practice

MP2.
Reason quantitatively.
MP6.
Attend to precision.

Students do a systematic review of the subtraction facts in third grade. In this lesson, students are introduced to strategies and tools used to practice and track their progress. The subtraction facts are organized by strategy into eight groups of nine facts each. This lesson involves the first two groups of facts that can be solved with the strategies using tens and thinking addition.

Content in this Lesson

  • Using mental math strategies to subtract [E6].
  • Connecting subtraction facts to their related addition facts [E7].

Daily Practice and Problems AA–BB

AA. Fact Families for Group 2

BB. Paper Dolls

X

Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Guide
Student Activity Book

Teacher Resources

 Teacher Guide - digital

Supplies for Students

envelope for storing flash cards

Materials for the Teacher

Display of Subtraction Facts I Know page (Student Activity Book) Page 77, optional
Unit 2 Assessment Record
Math Facts Class Record
Unit 2 Individual Assessment Record

Materials Preparation

Subtraction Flash Cards. Copy the Subtraction Flash Cards: Groups 1 and 2 double-sided on heavier paper. Ask students to cut them apart so that each student has eighteen flash cards.

Prepare Chart Storage. Prepare a central location in the classroom to store students' Subtraction Facts I Know charts so both you and students can revisit them throughout the year.

Assessment in this Lesson

Assessment Expectation Assessed

Assessing the Subtraction Facts
Self-Check: Subtraction Facts I Know
Student Guide
Page 50
E6.
Use mental math strategies including using tens and thinking addition to solve the subtraction facts in Groups 1 and 2.

DPP Item AA
Fact Families for Group 2
Teacher Guide - digital
E7.
Determine the unknown number in an addition or subtraction sentence relating three whole numbers for the facts in Groups 1 and 2.

Vocabulary in this Lesson