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How to write the last question on page 29 of the sixth grade mathematics highlight activation
The cuboid block below is cut into four sections. How many square centimeters does the surface area increase? This rectangle is 16 cm long, 3 cm wide and 2 cm high.

Solution: Cut into 4 sections and add 6 cross sections.

Then the surface area is increased by 16×3×6=288 cm2.