Earth, Moon, Sun

1
Earth, Moon, Sun Stars

• Solihull
• School

2
Brain Teaser

• Planets Large Small
• Matthew Mark are planning to make a classroom
  model of the solar system. Mercury, the smallest
  planet, has a diameter of 3,000 miles. Jupiter,
  the largest planet, has a diameter of 88,700
  miles. The boys have decided to use a pea
  measuring 0.5cm in diameter as the Mercury model.

3
Question

• Using the same scale, what size, to the nearest
  whole centimetre, should the diameter of the
  Jupiter model be?

4
Working Out

• 88700 887
• 3000 30
• Using long division answer 29.56
• 30 to the nearest whole number
• So 30 x 0.5cm or 30 x ½ 15cm

5
Solution

• Marks answer
• Jupiter is approximately 30 times larger than
  Mercury so its model also has to be 30 times
  larger. Therefore the scale diameter of the
  Jupiter model must be
• 15cm