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Step-by-step addition method showing 243 + 126 = 369, breaking numbers into hundreds, tens, and ones.

A colorful educational diagram illustrating the step-by-step process of adding 243 and 126 using expanded form, with a cartoon student expressing confusion.

A colorful educational diagram illustrating the step-by-step process of adding 243 and 126 using expanded form, with a cartoon student expressing confusion.

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