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Visual example of the "Breaking Up the Second Number" addition strategy, demonstrating how to solve 124 + 345 by decomposing 345 into 300, 40, and 5.

A handwritten math problem on lined paper showing the addition of 124 + 345 using the "breaking up the second number" strategy, with a teal circle at the bottom containing the text "Breaking Up the Second Number: A Strategy for Addition" and the website www.ShelleyGrayTeaching.com.

A handwritten math problem on lined paper showing the addition of 124 + 345 using the "breaking up the second number" strategy, with a teal circle at the bottom containing the text "Breaking Up the Second Number: A Strategy for Addition" and the website www.ShelleyGrayTeaching.com.

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