GCSE Maths (Edexcel)

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Estimating Roots

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Number Structure and Calculation

Estimating Roots

3:12 Advanced Indicies & Roots
Spec N6
Previous Negative Fractional Indices Next Standard Form
  • The square root of a non-square number can be estimated by evaluating the closest perfect square roots
  • To estimate the square root of a number, find the nearest perfect square root below and above the number
  • Use a number line to estimate where the square root of the number should go
  • The estimated square root will be between the two perfect square roots on the number line
  • The estimated square root may not be exact, but it is close enough for practical purposes
  • In exams, there will be a range of acceptable answers for estimating square roots

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