Guess these by writing down the numbers…
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GUESS THESE BY WRITING DOWN THE NUMBERS…
• How many stars do you think are in the Milky Way?• How many kilometres away do you think our sun is
from Earth?• How long do you think it would take you to fly to
Mars in a rocket?• The sun is made of mainly hydrogen and helium
gases. How heavy do you think a hydrogen atom is?• What do you think the diameter of a helium atom is?
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• 200 billion = 200,000,000,000• 150 million = 150,000,000• About 220 days for a particular route.
How many hours is This?• 220 x 24 = 5280 hours = mins
• 0.00000000000000000000000167grams (3.s.f)• Hydrogen is one-quarter the weight of
a helium atom.• 0.000000000001m
316,800
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• Powers of 10 • 102 = 10 × 10 = 100 • 103 = 10 × 10 × 10 = 1,000• 106 = 10 × 10 × 10 × 10 ×
10 × 10 = 1,000,000
• 1012 = 1,000,000,000,000• 5.34 × 1,000,000 • = 5.34 × 106
Compare the power to the number of zeros.
• Powers of 10 • 10-2 = = • 10-3 = = • 10-6 = = • 5.34 ×
• = 5.34 × 10-6
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Write these in standard form Write these in ordinary form