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Squares up to 30

Instant recall of 1² to 30² (and square roots)

The Rule

  1. 1Learn 1² to 30² by heart — squaring, square roots and many shortcuts depend on them.
  2. 2Anchor on the round ones: 10² = 100, 20² = 400, 25² = 625, 30² = 900.
  3. 3Go both ways: 17² = 289 and √289 = 17.