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UKMT Junior Kangaroo, 2022

Combinatorics Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

Sacha wants to cut a $6 \times 7$ rectangle into squares that all have integer length sides. What is the smallest number of squares he could obtain?

(A) $4$ (B) $5$ (C) $7$ (D) $9$ (E) $42$

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