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Indices without a calculator

hey there,
just needing help/advice on how to do indices without a calculator. i understand the concept all the the rules of indices but still struggle to do it in my head especially when the "power of" is a fraction.

if anyone knows of any videos, notes ect that could help thank you.
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Negative and Fractional Indices (Higher Only) | GCSE Maths Tutor:

I hope this helps

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