Level 1, Lesson 22: Square Any Two-Digit Number (Duplex)

Square the first digit, double the cross product, then square the last digit — join the three parts with carries.

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Q134 × 34

Q223 × 23

Q341 × 41

Q456 × 56

Q562 × 62

Q627 × 27

Q743 × 43

Q878 × 78