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Is it standard form?

Exercise and reference answers

Left
Standard form
Items
  1. Item
    2 x 10^9
    Answer
    Standard form
  2. Item
    3.5 x 10^-5
    Answer
    Standard form
  3. Item
    7 x 10^4
    Answer
    Standard form
  4. Item
    20 x 10^8
    Answer
    Not standard
  5. Item
    0.2 x 10^10
    Answer
    Not standard
  6. Item
    35 x 10^-6
    Answer
    Not standard
Right
Not standard
Instructions
Swipe each expression to whether it is written in proper standard form.
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