Question
Warren wanted to cut small identical 4 cm by 3 cm rectangles from a rectangular cardboard measuring 21 cm by 16 cm. What is the maximum number of complete small rectangles Warren could cut? (Note: Warren could rotate the small rectangle.)
3 m

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Warren wanted to cut small identical 4 cm by 3 cm rectangles from a rectangular cardboard measuring 21 cm by 16 cm. What is the maximum number of complete small rectangles Warren could cut? (Note: Warren could rotate the small rectangle.)