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How well did you do? Did you show calculations ? - PowerPoint PPT Presentation


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Do now: These cuboids are all made from 1 cm cubes. Can you find their volumes and surface areas? State the units in your answers. 1. 2. 3. 5. 6. 4. How well did you do? Did you show calculations ?. 1. 2. 3. V = 3 x 3 x 3 = 27cm 3. V = 1 x 2 x 4 = 8cm 3. V = 2 x 2 x 4 = 16cm 3. 5.

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Presentation Transcript
slide1

Do now: These cuboids are all made from 1 cm cubes.Can you find their volumes and surface areas?

State the units in your answers.

1

2

3

5

6

4

slide2

How well did you do? Did you show calculations ?

1

2

3

V = 3 x 3 x 3 = 27cm3

V = 1 x 2 x 4 = 8cm3

V = 2 x 2 x 4 = 16cm3

5

6

4

V = 4 x 4 x 2 = 32cm3

V = 3 x 3 x 5 = 45cm3

V = 2 x 4 x 4 = 32cm3

slide3

How well did you do? Did you show calculations ?

1

2

3

SA = 2 x 8 + 2 x 4 + 2 x 2

= 28cm2

SA = 2 x 4 + 2 x 8 + 2 x 8

= 40cm2

SA = 2 x 9 + 2 x 9 + 2 x 9

= 54cm2

5

6

4

SA = 2 x 9 + 2 x 15 + 2 x 15

= 78cm2

SA = 2 x 8 + 2 x 8 + 2 x 16

= 64cm2

SA = 2 x 16 + 2 x 8 + 2 x 8

= 64cm2

slide4

Challenge question 1:These two shapes each have a volume of 60cm3

Can you find the missing lengths?

1

2

?

6 cm

3 cm

5 cm

5 cm

?

Extra challenge: Can you find the length, width and height of another cuboid that has a volume of 60cm3 ?

slide5

How well did you do? Did you solve these problems correctly, showing your calculations?

1

2

?

6 cm

3 cm

5 cm

5 cm

?

3 x 5 x 4 = 60cm3

6 x 5 x 2 =60cm3

slide6

Challenge question 2:These two shapes have the same volume.

Can you find the missing length?

4 cm

8 cm

10 cm

5 cm

?

4 cm

slide7

How well did you do? Did you solve the problem correctly, showing your calculations?

4 cm

8 cm

10 cm

5 cm

?

3 cm

8 x 3 x 10 = 240cm3

4 x 5 x 12 =240cm3

How did you work out the answer?