Meet With Teacher- Volume 5.MD.5

Reteach from whole group instruction (small group)- Approaching

- Have students explore finding the volume of rectangular prisms by counting unit cubes in a shape using connecting cubes

- After exploring, have students record the Volume of each prism and the dimensions (ie. 12=4x3x1 so they can connect the formula for finding volume to the total number of units in each shape.

Specific concept mini-lesson (Rectangular prisms may have different dimensions but the same volume.)- On

- Use manipulatives. - Teacher makes a rectangular prism out of connecting cubes and students

find the volume by counting the cubes. - Teacher takes the same number of cubes that are in the first rectangular

prism and makes another rectangular prism with different dimensions and students once again count the cubes to find the volume.

- Have students discuss what they know about the two rectangular prisms (they can look very different but have the same volume)

- Students explore in partnerships using cubes to find as many rectangular prism dimensions they can that will result in a given volume.

- Students gain the understanding that rectangular prisms can have the same volume even if they have different shapes.

- Move students to connect this concept with using a formula to find volume (ie. 36= 6x6x1, 36=12x3x1, 36=9x4x1, 36= 3x4x3………)

Extension Activity- Above Model decomposing composite figures to find volume

- Using cubes, have students find the volume of an irregular rectangular prism by counting to unit cubes

- Break the figure into two rectangular prisms, have students find the volume of each prism.

- Have students discuss what they are noticing (if you add the volume of the two rectangular prisms together, you get the volume of the original shape.

- Once students understand they can break a figure into rectangular prisms and add the volume of each rectangular prism together with cubes, give students an example where they will draw a line to divide shape into rectangular prisms.

- Work with students to determine the dimensions of the two different

rectangular prisms (understanding the labeled dimensions will be different) - Have students practice decomposing composite figures (you can extend by

using examples that require students to break apart into more than two rectangular prisms.