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Cubes up to 20

Instant recall of 1³ to 20³ (and cube roots)

The Rule

  1. 1Learn 1³ to 20³ by heart — cube roots and cubing tricks depend on them.
  2. 2Note the last digits: 2³ ends in 8, 3³ in 7, 7³ in 3, 8³ in 2; the rest end in themselves.
  3. 3Go both ways: 13³ = 2197 and ∛2197 = 13.