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Subtracting Decimals

In this Grade 5 honors math problem of the day, students explore the revolving periods of Saturn and Jupiter around the Sun. Saturn takes 29.45 Earth years, while Jupiter takes 11.862 Earth years. The goal is to determine how much longer Saturn takes to revolve than Jupiter. This involves recognizing important facts and suggesting subtraction as the key operation for the problem. Students are guided through the process of subtracting decimals, emphasizing the need to align decimal points, use placeholders, and properly manage regrouping.

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Subtracting Decimals

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  1. Subtracting Decimals Honors Math – Grade 5

  2. Problem of the Day Saturn takes 29.45 Earth years to revolve around the Sun. Jupiter takes 11.862 Earth years to revolve around the Sun. How much longer does Saturn take than Jupiter? What are the important facts? What operation does this word problem suggest? Subtraction! Let’s take a closer look…

  3. To subtract decimals… 1. Line up the decimal points. Add zeros as place holders if necessary. Subtract normally from right to left regrouping as necessary. Write the decimal point in the difference.

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