A pencil is 12 cm long. A pen is 15 cm long. How much longer is the pen?

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• A 2 cm
• B 3 cm
• C 5 cm
• D 7 cm

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Answer: B. 3 cm

To find how much longer, subtract the shorter length from the longer one: 15 - 12 = 3 cm. Counting on from 12 to 15 also gives 3.

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