I watched the videos for all of these but I still don't get problems 2B and 2A.

No, it's easy it's just that you have to split them apart and then find the height for the first one.

This was not as easy as the two videos above it make it seem.

I totally agree. In the videos he does all the special colors to draw and it kinda distracts you from the actual learning of it. In the videos it looks very simple and easy, but when you are actually doing it ends up being confusing and you have many questions. At least that's how it is for me. If I was to make the videos I would try to focus from the point of view of someone who does not get the math instead of from the point of view of someone who does get it showing you it. I think that the hints are more helpful because they are made for someone who is having a little trouble with the math. The bad part is though that if you use a hint that helps you it automatically says you got it wrong, but if you watch a video that makes you more confused you get energy points for watching it.

Is there a faster way to do the section with decomposing figures with unit cubes?

Yes there is a faster way, if the rectangular box-shaped pieces have a common dimension (that is, the same length, same width, or same height). For example, if the pieces have the same height, you could find the area of the base of the whole figure, by adding up areas of the rectangular bases of the pieces. Then you could multiply the area of the base of the entire figure by the height to finish the problem.

I watched both videos and pay attention and still don't get 2A and 2B.

Basically, you have to split the shape into two rectangular prisms, then find the volume for each and solve.

Okay, so I clicked on the next practice and made sure I had finished this one and now it's making me restart the whole thing.

it does that to everyone i think -_-

Main content

Course: 5th grade > Unit 11

Lesson 3: Decompose figures to find volume

Decompose figures to find volume practice

Google Classroom

Work through volume of irregular 3D figures problems that get increasingly more challenging. The first items will have unit cubes. Then, try some with only side-length labeled.

Decompose figures with unit cubes

Problem 1A

Unit cube:

What is the volume of the following figure?

Front View	Back View

unit cubes

Problem 1B

Unit cube:

What is the volume of the following figure?

Front View	Back View

unit cubes

Want to practice more problems like this? Check out this exercise.

Decompose figures with side-length labels

Problem 2B

The figure below is made of

2

rectangular prisms.

What is the volume of this figure?

cubic in

Problem 2A

The figure below is made of

2

rectangular prisms.

What is the volume of this figure?

cubic cm

Want to practice more problems like this? Check out this exercise.

Want to join the conversation?

Sort by:

Aaniyah Dominguez
Posted 6 years ago. Direct link to Aaniyah Dominguez's post “I watched the videos for ...”
I watched the videos for all of these but I still don't get problems 2B and 2A.
Button navigates to signup pageComment on Aaniyah Dominguez's post “I watched the videos for ...”
(94 votes)
Answer
- 239547
  Posted a year ago. Direct link to 239547's post “No, it's easy it's just t...”
  No, it's easy it's just that you have to split them apart and then find the height for the first one.
  Comment on 239547's post “No, it's easy it's just t...”
  (15 votes)
Vada Hutchinson
Posted 4 years ago. Direct link to Vada Hutchinson's post “This was not as easy as t...”
This was not as easy as the two videos above it make it seem.
Button navigates to signup pageComment on Vada Hutchinson's post “This was not as easy as t...”
(35 votes)
Answer
- Ella Winnicki
  Posted 4 years ago. Direct link to Ella Winnicki's post “I totally agree. In the v...”
  I totally agree. In the videos he does all the special colors to draw and it kinda distracts you from the actual learning of it. In the videos it looks very simple and easy, but when you are actually doing it ends up being confusing and you have many questions. At least that's how it is for me. If I was to make the videos I would try to focus from the point of view of someone who does not get the math instead of from the point of view of someone who does get it showing you it. I think that the hints are more helpful because they are made for someone who is having a little trouble with the math. The bad part is though that if you use a hint that helps you it automatically says you got it wrong, but if you watch a video that makes you more confused you get energy points for watching it.
  Comment on Ella Winnicki's post “I totally agree. In the v...”
  (61 votes)
Jacob Hatlas
Posted 5 years ago. Direct link to Jacob Hatlas's post “Is there a faster way to ...”
Is there a faster way to do the section with decomposing figures with unit cubes?
Button navigates to signup pageComment on Jacob Hatlas's post “Is there a faster way to ...”
(23 votes)
Answer
- Ian Pulizzotto
  Posted 2 years ago. Direct link to Ian Pulizzotto's post “Yes there is a faster way...”
  Yes there is a faster way, if the rectangular box-shaped pieces have a common dimension (that is, the same length, same width, or same height). For example, if the pieces have the same height, you could find the area of the base of the whole figure, by adding up areas of the rectangular bases of the pieces. Then you could multiply the area of the base of the entire figure by the height to finish the problem.
  Comment on Ian Pulizzotto's post “Yes there is a faster way...”
  (11 votes)
rocquemore.mariah
Posted 6 years ago. Direct link to rocquemore.mariah's post “Can you all start easy an...”
Can you all start easy and if we is gitting it wright,it can start gitting harder?
Button navigates to signup pageComment on rocquemore.mariah's post “Can you all start easy an...”
(17 votes)
Answer
ZOE466
Posted 4 years ago. Direct link to ZOE466's post “I watched both videos and...”
I watched both videos and pay attention and still don't get 2A and 2B.
Button navigates to signup pageComment on ZOE466's post “I watched both videos and...”
(8 votes)
Answer
- JaslynL
  Posted 2 years ago. Direct link to JaslynL's post “Basically, you have to sp...”
  Basically, you have to split the shape into two rectangular prisms, then find the volume for each and solve.
  Button navigates to signup page
  (11 votes)
Woojae Jeong
Posted 4 months ago. Direct link to Woojae Jeong's post “Volume can be tough, but ...”
Volume can be tough, but with motivation, you can power through!
Button navigates to signup pageComment on Woojae Jeong's post “Volume can be tough, but ...”
(8 votes)
Answer
P A R I S A :3
Posted 4 years ago. Direct link to P A R I S A :3's post “Okay, so I clicked on the...”
Okay, so I clicked on the next practice and made sure I had finished this one and now it's making me restart the whole thing.
Button navigates to signup pageComment on P A R I S A :3's post “Okay, so I clicked on the...”
(7 votes)
Answer
- bebrunson
  Posted a year ago. Direct link to bebrunson's post “it does that to everyone ...”
  it does that to everyone i think -_-
  Button navigates to signup page
  (2 votes)
KYRA
Posted a year ago. Direct link to KYRA's post “Can there be a drawing to...”
Can there be a drawing tool to use
Button navigates to signup pageComment on KYRA's post “Can there be a drawing to...”
(6 votes)
Answer
- SOMEONE
  Posted a month ago. Direct link to SOMEONE's post “there is”
  there is
  Button navigates to signup page
  (2 votes)
Olivia C.
Posted 2 years ago. Direct link to Olivia C.'s post “honestly all of these mak...”
honestly all of these make no sence to me and im a 5th grader
Button navigates to signup pageComment on Olivia C.'s post “honestly all of these mak...”
(6 votes)
Answer
the oskinos sausage
Posted 8 months ago. Direct link to the oskinos sausage's post “whats the point of doing ...”
whats the point of doing homework
Button navigates to signup pageComment on the oskinos sausage's post “whats the point of doing ...”
(3 votes)
Answer
- EowynS
  Posted 8 months ago. Direct link to EowynS's post “to practice.”
  to practice.
  Button navigates to signup page
  (7 votes)