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What sets of equivalent percentages, fractions and decimals do you know

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What sets of equivalent percentages, fractions and decimals do you know? ... How would you use a calculator to find 12% of 2800 using the. x and keys? ... – PowerPoint PPT presentation

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Title: What sets of equivalent percentages, fractions and decimals do you know


1
  • What sets of equivalent percentages, fractions
    and decimals do you know?
  • Explain how you can use these to find other
    equivalent sets?

2
  • How would you use a calculator to find 12 of
    2800 using the
  • x and keys?

How would you use a calculator to find 12 of
2800 using the x key only?
Why do both work? Which method is more efficient?
3
  • 10 is the same as 1/10,
  • so 20 must be the same as 1/20.
  • Is this true or false?
  • Why?

4
  • What percentages of given quantities can you
    easily work out in your head?
  • Talk me through a couple of examples.

5
  • When calculating percentages of quantities, what
    percentages do you usually start from?
  • How do you use this percentage to work out others?
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