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Powers and roots


Powers - using a calculator

All scientific calculators have a 'power' button. This is usually labelled [xy]. This is particularly useful when the index number is large.


To work out 4 10:

  • Enter 4

  • Press the xy button

  • Enter 10

  • Press =

You should get the answer 1 048 576.


Use your calculator to find the values of the following:

a) 211
b) 58
c) 26 × 35


a) 2048
b) 390625
c) 26 × 35 = 64 × 243 = 15552


Powers and roots activity

Have you got the power? Find out with this activity?



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