Structure and calculation · 5 lessons
From repeated multiplication to working backwards. Build the meaning of a power, recognise familiar numbers, and find their roots.
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The lessons
Index notation and powers
What the base and index mean, and writing repeated multiplication as a power.
Recognising powers of a number
The squares, cubes and powers of 2, 3, 4 and 5 worth recalling.
Square roots
The square root as the inverse of squaring, found by reversing a known square.
Positive and negative square roots
When an equation has two solutions, and why a root symbol gives one value.
Cube roots and higher roots
Cube roots and nth roots as the inverse of a power, including negatives.