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Dimensions Math Teacher's Guide 3A

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Dimensions Math Teacher's Guide 3ADimensions Math Teacher's Guide 3A Chapter 1: Numbers to 10,000 Teaching Notes Chapter Opener Lesson 1: Numbers to 10,000 Lesson 2: Place Value Part 1 Lesson 3: Place Value Part 2 Lesson 4: Comparing Numbers Lesson 5: The Number Line Lesson 6: Practice A Lesson 7: Number Patterns Lesson 8: Rounding to the Nearest Thousand Lesson 9: Rounding to the Nearest Hundred Lesson 10: Rounding to the Nearest Ten Lesson 11: Practice B Workbook Solutions Chapter

Dimensions Math® Teacher's Guide 3A

Chapter 1: Numbers to 10,000

Teaching Notes
Chapter Opener
Lesson 1: Numbers to 10,000
Lesson 2: Place Value — Part 1
Lesson 3: Place Value — Part 2
Lesson 4: Comparing Numbers
Lesson 5: The Number Line
Lesson 6: Practice A
Lesson 7: Number Patterns
Lesson 8: Rounding to the Nearest Thousand
Lesson 9: Rounding to the Nearest Hundred
Lesson 10: Rounding to the Nearest Ten
Lesson 11: Practice B
Workbook Solutions

Chapter 2: Addition and Subtraction — Part 1

Teaching Notes
Chapter Opener
Lesson 1: Mental Addition — Part 1
Lesson 2: Mental Addition — Part 2
Lesson 3: Mental Subtraction — Part 1
Lesson 4: Mental Subtraction — Part 2
Lesson 5: Making 100 and Making 1,000
Lesson 6: Strategies for Numbers Close to Hundreds
Lesson 7: Practice A
Lesson 8: Sum and Difference
Lesson 9: Word Problems — Part 1
Lesson 10: Word Problems — Part 2
Lesson 11: 2-Step Word Problems
Lesson 12: Practice B
Workbook Solutions

Chapter 3: Addition and Subtraction — Part 2

Teaching Notes
Chapter Opener
Lesson 1: Addition with Regrouping 
Lesson 2: Subtraction with Regrouping — Part 1
Lesson 3: Subtraction with Regrouping — Part 2
Lesson 4: Estimating Sums and Differences — Part 1
Lesson 5: Estimating Sums and Differences — Part 2
Lesson 6: Word Problems
Lesson 7: Practice
Workbook Solutions

Chapter 4: Multiplication and Division

Teaching Notes
Chapter Opener
Lesson 1: Looking Back at Multiplication
Lesson 2: Strategies for Finding the Product
Lesson 3: Looking Back at Division
Lesson 4: Multiplying and Dividing with 0 and 1
Lesson 5: Division with Remainders
Lesson 6: Odd and Even Numbers
Lesson 7: Word Problems — Part 1
Lesson 8: Word Problems — Part 2
Lesson 9: 2-Step Word Problems
Lesson 10: Practice 
Review 1
Workbook Solutions

Chapter 5: Multiplication

Teaching Notes
Chapter Opener
Lesson 1: Multiplying Ones, Tens, and Hundreds
Lesson 2: Multiplication Without Regrouping
Lesson 3: Multiplication with Regrouping Tens
Lesson 4: Multiplication with Regrouping Ones
Lesson 5: Multiplication with Regrouping Ones and Tens
Lesson 6: Practice A
Lesson 7: Multiply a 3-digit Number with Regrouping Once
Lesson 8: Multiplication with Regrouping More Than Once
Lesson 9: Practice B
Workbook Solutions

Chapter 6: Division

Teaching Notes
Chapter Opener
Lesson 1: Dividing Tens and Hundreds
Lesson 2: Dividing a 2-digit Number by 2 — Part 1
Lesson 3: Dividing a 2-digit Number by 2 — Part 2
Lesson 4: Dividing a 2-digit Number by 3, 4, and 5
Lesson 5: Practice A
Lesson 6: Dividing a 3-digit Number by 2
Lesson 7: Dividing a 3-digit Number by 3, 4, and 5
Lesson 8: Dividing a 3-digit Number, Quotient is 2 Digits
Lesson 9: Practice B
Workbook Solutions

Chapter 7: Graphs and Tables

Teaching Notes
Chapter Opener
Lesson 1: Picture Graphs and Bar Graphs
Lesson 2: Bar Graphs and Tables
Lesson 3: Practice
Review 2
Workbook Solutions

Blackline Masters for 3A

Click here to view samples of Dimensions Math® Teacher's Guide 3A.

Dimensions Math® PreK-5 series features the progression, rigor, and pacing that define Singapore math. Throughout the series, five characters offer students suggestions on how to think about problems. They remind students of strategies they’ve learned and point out important information that encourages them to come up with their own solutions.

Textbook lessons begin with a task that allows students to apply their previous knowledge and learn through discussion. Once students have mastered a concept with the use of concrete and pictorial aids, they are ready to take on more abstract mathematical problem sets. They reach fluency by collecting various strategies along the way and applying them to new problems. Word problems give students a sense of math in real-world contexts. 

Workbooks offer independent practice that follows a careful progression of exercise variation. Each textbook lesson includes a corresponding workbook exercise that starts with pictorial representation and progresses to more challenging abstract problems. Workbooks for PreK-2 are perforated. 

Teacher’s Guides include lesson plans, mathematical background, games, helpful suggestions, and comprehensive resources for daily lessons. Lessons are laid out clearly and activities are designed for the whole class, small groups, and extension.

Textbooks and Workbooks do not include answer keys. Answers are in Teacher's Guides.
ISBN  9781947226364
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SKU: 92989872833

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Lula-A1A
Carnegie, US
★★★★★ 5
Great WFH screen for video calls
Color: Black, Size: 22"- 4 Panel
I share a workspace with my hubs since we both work from home. I have the attention span of a 🐿️ and need this so I can focus on my work and not get distracted by him, since he is very amusing to watch. This screen is very lightweight and the panels can move and create a little cubicle around your workspace. I personally loved cubicles & despise open space seating, even at home. The ADHDer in my loves being able to block things away from my field of vision. These panels also hide any mess behind you, especially if you forget to blur the background on Teams or Zoom calls or if you don’t have the option to change your backgrounds. This was fairly easy to put together and very easy to move and adjust. The screen is a much better option than a sheet as I’ve seen others use on calls.🤦🏻‍♀️😂 I’m not sure how it will stand up around rambunctious pets or kids, but fairly certain it takes quite a push to knock it over. We have four cats & I’m pretty sure someone would try to climb this, which is why they’re not allowed in our workspace.
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Reviewed in the United States on April 10, 2025
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Aidan
Houston, US
★★★★★ 4
Difficult to assemble, but a good basic divider
Color: Beige, Size: 22"- 4 Panel
I bought this to use as a background for when I have video calls. I wish I'd ordered the 6- or even 8-panel to block a little more, but that's my own error. It still covers a good portion of the room, so I'll make do, or maybe buy another at a later date to expand it. It looks ok, if a little plain. The fabric panels have creases in them from being folded and will need to be steamed or ironed out for a nicer look. It would be easy to make your own panels as well, if you're so inclined. The construction is decent. The frame is lightweight and if you don't angle the base supports the right way it may tip over if you extend it too far. The fabric panels aren't the highest quality, but are sturdy enough. They seem like they would handle being thrown in the wash well. The only issue I have with it is that it was so difficult to put together. The push latches that connect the poles don't push it well and hurt my hands. The fabric panels are sized to be extremely taut, which makes it very difficult to get them on the bars without forcing the bar to bend slightly. Overall, this is a good divider if you're looking for something simple and functional without being too worried about aesthetic. It's also a good, inexpensive base if you want to make your own custom panels.
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Reviewed in the United States on August 5, 2025
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DollarBill
Lake Worth, US
★★★★★ 5
Great Room divider
Color: Beige, Size: 34"- 3 Panel
Works well in separating my kids play area from my computer/office room. Easy to put together, height is perfect somewhat sturdy, looks great, light weight, not good if you are using it as a door, but if it is to stay in place than it is stable enough.
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Reviewed in the United States on September 3, 2025
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zakah123
Carnegie, US
★★★★★ 5
Exactly what I needed
Color: Black, Size: 34"- 3 Panel, Color: Black, Size: 34"- 3 Panel
It was easy to put together even without a power drill. Completely opaque. Only a very small slit between poles. I plan to add black electrical tape, but that's because I don't want nosies peeking through to see my screen. The height is beautiful. I was afraid it wouldn't be as tall as I needed. But it is perfect. I share a small office with a good buddy of mine. People passing by our door is distracting and invites them to speak to me. I needed something that would stop the former and prevent the latter, especially when I'm deep in concentration mode. The two panels are enough to block outsiders and the third panel I will employ when I can't even be disturbed by my officemate. It's the fastest and easiest signal not to disrupt me at all. 10/10
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Reviewed in the United States on August 3, 2025
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mrcricket
Bozeman, US
★★★★★ 3
Packaging contents
Color: Grey, Size: 34"- 3 Panel
Item is as described however this one appeared to be open and some parts possibly used. Example pole packaging mislabeled one had the letter K as a part there is no letter K item in the instructions. Another pole part had a taped on letter A which is completely different from the others thus indicating that it was opened or substituted. Finally after the partition was completely put together one of the bottom screw connection anchors came out making the partition unable to stand. I'm going to have to rig something up in order to get the anchor connected to the bottom panel. In closure the partion could be very acceptable and do the job if it was new and parts labeled correctly. I have pictures of all parts and packaging errors. Would buy again if new. I'm going to pursue some kind of compensation.
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Reviewed in the United States on March 15, 2026

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