Question

How many unit cubes need to be added to the figure so that it will have a total

volume of 12 cubic units?

Answer 1

Count the units in total shown here:

There are 2 units both in the back and front.

So double of 2 means 4 units, there are 4 units on the back and front.

Now count the units between them:

There are 4 units across from them.

Add the units together:

4 + 4

= 8, there are 8 units in total shown in this figure.

But, we need to find how many more units should be added to these 8 units to get a result of 12 units altogether.

So, subtract the 8 units from the 12 units to get the remaining units you would need to add to 8 units to get 12.

12 - 8

= 4, you would need 4 more units so that this figure would have a volume of 12.

Answer 2

c. 4

Explanation:

see how many cubes are already there. Then, subtract that answe from 12 to get how many you need.