how well did you do? did you show calculations ?
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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. - PowerPoint PPT PresentationTRANSCRIPT
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
4 5 6
How well did you do? Did you show calculations ?
1 2 3
4 5 6
V = 1 x 2 x 4 = 8cm3 V = 2 x 2 x 4 = 16cm3V = 3 x 3 x 3 = 27cm3
V = 3 x 3 x 5 = 45cm3 V = 2 x 4 x 4 = 32cm3V = 4 x 4 x 2 = 32cm3
SA = 2 x 9 + 2 x 15 + 2 x 15= 78cm2
SA = 2 x 16 + 2 x 8 + 2 x 8= 64cm2
SA = 2 x 4 + 2 x 8 + 2 x 8= 40cm2
SA = 2 x 9 + 2 x 9 + 2 x 9= 54cm2
How well did you do? Did you show calculations ?
1 2 3
4 5 6
SA = 2 x 8 + 2 x 4 + 2 x 2= 28cm2
SA = 2 x 8 + 2 x 8 + 2 x 16= 64cm2
Extra challenge: Can you find the length, width and height of another cuboid that has a volume of 60cm3 ?
Challenge question 1:These two shapes each have a volume of 60cm3
Can you find the missing lengths?
1 2
?
6 cm
5 cm
?
3 cm 5 cm
3 x 5 x 4 = 60cm3
How well did you do? Did you solve these problems correctly, showing your calculations?
1 2
?
6 cm
5 cm
?
3 cm 5 cm
6 x 5 x 2 =60cm3
Challenge question 2:These two shapes have the same volume.
Can you find the missing length?
5 cm
4 cm
?
8 cm
4 cm 10 cm
How well did you do? Did you solve the problem correctly, showing your calculations?
5 cm
4 cm
?
8 cm
3 cm 10 cm
8 x 3 x 10 = 240cm3 4 x 5 x 12 =240cm3
How did you work out the answer?