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Add mentally by rounding off-- A complete course in arithmetic
瀏覽：675
日期：2026-04-22
Lesson 5 Section 2 MORE ELEMENTARY ADDITION Mental calculation by Rounding off or Regrouping Back to Section 1 A basic property of addition is the following: A sum will not change if we both add and subtract the same number, or if we add a number to ......看更多
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