Navigation

K-5 Grade 1 Unit 2 Lesson 4

Gradeband

•K-5 Math 6-8 Math 9-12 Math

Course

Kindergarten •Grade 1 Grade 2 Grade 3 Grade 4 Grade 5

Unit

Unit 1 •Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Unit 7 Unit 8

Lesson

Lesson 1 Lesson 2 Lesson 3 •Lesson 4 Lesson 5 Lesson 6 Lesson 7 Lesson 8 Lesson 9 Lesson 10 Lesson 11 Lesson 12 Lesson 13 Lesson 14 Lesson 15 Lesson 16 Lesson 17 Lesson 18 Lesson 19 Lesson 20 Lesson 21 Lesson 22 Lesson 23

K-5
6-8
9-12

Kindergarten
Grade 1
Grade 2
Grade 3
Grade 4
Grade 5

Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
Unit 7
Unit 8

Lesson 1
Lesson 2
Lesson 3
Lesson 4
Lesson 5
Lesson 6
Lesson 7
Lesson 8
Lesson 9
Lesson 10
Lesson 11
Lesson 12
Lesson 13
Lesson 14
Lesson 15
Lesson 16
Lesson 17
Lesson 18
Lesson 19
Lesson 20
Lesson 21
Lesson 22
Lesson 23

Lesson | Loading...

Sign in to access protected content and invite other educators

Sign in using your existing Kendall Hunt account. If you don’t have one, create an educator account.

Curriculum

IM K-5 Math
IM 6-8 Math
IM 9-12 Math

Professional Learning

Illustrative Mathematics® has operated as an independent 501(c)3 non-profit organization since 2013.

©2024 Illustrative Mathematics®. Licensed under CC BY-NC 4.0.

The Illustrative Mathematics name and logo are not subject to the Creative Commons license and may not be used without the prior and express written permission of Illustrative Mathematics.

This site includes public domain images or openly licensed images that are copyrighted by their respective owners. Openly licensed images remain under the terms of their respective licenses. See the image attribution section for more information.

Settings

Audience

Not all roles available for this page.

Assessment Access

Sign in to view assessments and invite other educators

Sign in using your existing Kendall Hunt account. If you don’t have one, create an educator account.

teacher
student
family

Lesson 4

Warm-up Activity 1 Activity 2 Student Section Summary

Unit 2, Lesson 4

A Change Unknown

Grade 1

Warm-up

Find the value of each expression mentally.

Activity 1

Andre checks out some books from the library.
Mai gives him more books.
Now Andre has 9 books.

What do you notice?
What do you wonder?
Andre checks out 3 books from the library.
Mai gives him some more books.
Now Andre has 9 books.
How many books did Mai give him?

Lin made this drawing.

How does Lin's drawing show how many books Mai gave Andre?

Activity 2

Find the number that makes each equation true.

Student Section Summary

We solved story problems.
We represented the problems with objects, drawings, and words.

We solved story problems with addition.

Mai reads 3 books about dogs.
Then she reads 4 more books.
How many books does Mai read all together?
We solved story problems with subtraction.

Tyler has 7 books about spiders.
He gives 3 to Kiran to read.
How many books does Tyler have left?
We solved story problems where the change was unknown.

Lin has 5 books.
Her teacher gives her some more books.
Now Lin has 10 books.
How many books did the teacher give her?
We learned that the equal sign, , means “the same amount as” and “equals.”

Standards Alignment

Building On

Addressing

1.OA.5

Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

View Full Standard

1.OA.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

View Full Standard

Building Toward

Standards Alignment

Building On

Addressing

1.OA.1

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

View Full Standard

1.OA.5

Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

View Full Standard

Building Toward

1.OA.7

Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.

View Full Standard

1.OA.8

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _.

View Full Standard

Standards Alignment

Building On

Addressing

1.OA.5

Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

View Full Standard

1.OA.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

View Full Standard

1.OA.7

Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.

View Full Standard

1.OA.8

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _.

View Full Standard

Building Toward