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Level 7-8 Numbers - Indices

A pond plant doubles its surface area every four days. If it covered an area of 20 square centimetres on 17th June, what is its area on 15th July? You need to calculate this to answer question 9

Level 7-8 Numbers - Indices

In the Powers quiz you saw how, by writing numbers as powers of a common base, multiplication and division can be turned into addition or subtraction of indices making calculations with large or small numbers easier, as long as you follow the Maths rules.

Which of these options do you prefer?

  1. What is the result of 16 x 64 as a power of 2?

  2. What is the result of 27 ÷ 28?

  3. What is the result of dividing 25 by 625?

  4. What is 0.24 as a power of 5?

  5. What index number must follow 3 to give 6,561?

  6. What is the result of 24 x 83?

  7. How many litres will fill a cube of side length 25 cm?

  8. How many days are there in 29 x 33 x 54 seconds?

  9. A pond plant doubles its surface area every four days. If it covered an area of 20 cm2 on 17th June, what is its area on 15th July?

  10. John started a savings account with a deposit of £500 at 1.5% compound interest per year. How much (to the nearest 1p) is the account worth after three years?

Quiz written by Hilary Wilson

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