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Adding with Partial Sums (Three-Digit Numbers)
Adding with Partial Sums (Three-Digit Numbers)
Adding with Partial Sums (Three-Digit Numbers)
Adding with Partial Sums (Three-Digit Numbers)
Adding with Partial Sums (Three-Digit Numbers)
Adding with Partial Sums (Three-Digit Numbers)
Adding with Partial Sums (Three-Digit Numbers)
Adding with Partial Sums (Three-Digit Numbers)
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What others say

"This was exactly what my students needed to strengthen their understanding of the partial sums strategy. It helped them see how place value connects to addition and subtraction and filled in some key learning gaps!"
star
Olivia L.
"Partial sums is my class’ favorite way to add 2 and 3 digit numbers. They don’t make any mistakes typical with regrouping."
star
Buyer B.

Description

What is this?

Included in this file is one instructional PowerPoint teaching students how to add three-digit numbers with and without regrouping using the partial sums strategy.

What is included?

This resource includes several different pieces:

•One PowerPoint Slideshow modeling and practicing how to add three-digit numbers with and without regrouping. The regrouping is introduced gradually- regrouping in the ones place, regrouping in the tens place, and regrouping in the tens and ones place.

•Five practice books with six problems in each book. The books practice addition without regrouping, regrouping in the ones place, regrouping in the tens place, and regrouping in the tens and ones place, and then mixed practice. There are two versions of the books. One has all the boxes as prompts to support students and the other is blank.

•Five homework pages practicing addition without regrouping, regrouping in the ones place, regrouping in the tens place, and regrouping in the tens and ones place, and then mixed practice.

• A parent letter modeling and explaining the importance of adding using partial sums.

•A six problem assessment. There are two versions of the assessment. One has all the boxes as prompts to support students and the other is blank.

•Anchor chart modeling how to add with expanded form. The anchor chart is available as a full sheet or half sheet for students to glue into their math notebooks.

How do I use the PowerPoints?

In order to use these activities, you must have PowerPoint. I do not believe that they can be played on a Mac.

Open the activity in PowerPoint. Some of the PowerPoints are simply slide shows. However, others that require clicking and dragging are different. For these, DO NOT start as a slide show. Simply view the show in Edit Mode and click and drag the pieces to move. When the students are ready to practice the next slide, select the next slide from the window. Please note that these slides must be viewed in Edit Mode. There are explicit teacher instructions included for the PowerPoint to avoid any confusion.

These activities are designed to be projected onto an interactive Smart Board or whiteboard. However, they can be played on any device that can play a PowerPoint presentation. Please note that these activities are not editable in order to be in compliance with the clip artists’ terms of use.

Report this resource to TPT
Reported resources will be reviewed by our team. Report this resource to let us know if this resource violates TPT's content guidelines.

Adding with Partial Sums (Three-Digit Numbers)

Mandy Gregory
10.5k Followers
$4.00

Highlights

Digital downloads
Standards icon
Standards
Pages
45

What others say

"This was exactly what my students needed to strengthen their understanding of the partial sums strategy. It helped them see how place value connects to addition and subtraction and filled in some key learning gaps!"
star
Olivia L.
"Partial sums is my class’ favorite way to add 2 and 3 digit numbers. They don’t make any mistakes typical with regrouping."
star
Buyer B.

Save even more with bundles

Looking for activities and resources to teach three-digit addition? Buy this bundle and SAVE $4 (one free product)!This bundle includes:Three-Digit Addition Math CentersThree Digit Addition Math StoriesAdding with Partial Sums These are perfect for whole group instruction, small group instruction, A
Price $10.00Original Price $14.00Save $4.00
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Description

What is this?

Included in this file is one instructional PowerPoint teaching students how to add three-digit numbers with and without regrouping using the partial sums strategy.

What is included?

This resource includes several different pieces:

•One PowerPoint Slideshow modeling and practicing how to add three-digit numbers with and without regrouping. The regrouping is introduced gradually- regrouping in the ones place, regrouping in the tens place, and regrouping in the tens and ones place.

•Five practice books with six problems in each book. The books practice addition without regrouping, regrouping in the ones place, regrouping in the tens place, and regrouping in the tens and ones place, and then mixed practice. There are two versions of the books. One has all the boxes as prompts to support students and the other is blank.

•Five homework pages practicing addition without regrouping, regrouping in the ones place, regrouping in the tens place, and regrouping in the tens and ones place, and then mixed practice.

• A parent letter modeling and explaining the importance of adding using partial sums.

•A six problem assessment. There are two versions of the assessment. One has all the boxes as prompts to support students and the other is blank.

•Anchor chart modeling how to add with expanded form. The anchor chart is available as a full sheet or half sheet for students to glue into their math notebooks.

How do I use the PowerPoints?

In order to use these activities, you must have PowerPoint. I do not believe that they can be played on a Mac.

Open the activity in PowerPoint. Some of the PowerPoints are simply slide shows. However, others that require clicking and dragging are different. For these, DO NOT start as a slide show. Simply view the show in Edit Mode and click and drag the pieces to move. When the students are ready to practice the next slide, select the next slide from the window. Please note that these slides must be viewed in Edit Mode. There are explicit teacher instructions included for the PowerPoint to avoid any confusion.

These activities are designed to be projected onto an interactive Smart Board or whiteboard. However, they can be played on any device that can play a PowerPoint presentation. Please note that these activities are not editable in order to be in compliance with the clip artists’ terms of use.

Report this resource to TPT
Reported resources will be reviewed by our team. Report this resource to let us know if this resource violates TPT's content guidelines.

Reviews

4.8
Rated 4.76 out of 5, based on 42 reviews
42
ratings
5
34
4
7
3
0
2
0
1
1
Mostly used with 2nd and 3rd grades
Reviews
1
1
1
15
16
1
PreK
K
1st
2nd
3rd
4th
All verified TPT purchases
Great Resource
Rated 5 out of 5
March 12, 2026
Met expectations
Great value
Standards-aligned
This was perfect for my students who were struggling with partial sums. They helped tremendously.
Denise R.
593 reviews • Arizona
Grades taught: 2nd
Great Resource for Partial Sums Practice!
Rated 5 out of 5
October 29, 2025
This was exactly what my students needed to strengthen their understanding of the partial sums strategy. It helped them see how place value connects to addition and subtraction and filled in some key learning gaps!
Olivia L.
669 reviews • New Jersey
Grades taught: 3rd
Good resource
Rated 4 out of 5
September 11, 2025
Met expectations
Great value
Standards-aligned
Love using this product! Way more than enough to help practice this skill
Michaela C.
221 reviews
Grades taught: PreK, K, 1st, 2nd, 3rd
Rated 5 out of 5
April 11, 2025
Great resource to help practice this strategy. Easy to use and kid friendly.
Tori K.
213 reviews
Grades taught: 2nd
Rated 5 out of 5
March 20, 2025
Great for use in small groups and for students to complete at centers.
Lisa G.
756 reviews
Grades taught: 2nd
Rated 5 out of 5
December 8, 2024
Partial sums is my class’ favorite way to add 2 and 3 digit numbers. They don’t make any mistakes typical with regrouping.
Buyer B.
975 reviews
Grades taught: 2nd
Rated 5 out of 5
November 18, 2024
Great! My students were highly engaged and enjoyed the task.
Rebekah B.
225 reviews
Grades taught: 3rd
Rated 5 out of 5
January 25, 2024
Great resource! Thank you for making life a bit easier in the classroom! :)
328 reviews
Grades taught: 2nd
Student populations: Mild to severe disabilities

Questions & Answers

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Standards

to see state-specific standards (only available in the US).
Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:
The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).
Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
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