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It means that you can validate the solution by verifying the answer. The answer of 19 for the equation of 47 - 28 = n, is reasonable because 28 + 19 = 47. If the equation is more difficult, showing your work every step along the way to the answer.

Just show your work in detail and then checking your solution makes the answer of the math equation reasonable.

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14y ago

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Q: What does reasonableness mean in third grade math?
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