Place Value with Decimals

Lesson 5

Math

Unit 1

5th Grade

Lesson 5 of 13

Objective


Explain patterns in the number of zeros of the quotient when dividing a whole number by 10. Recognize that in a multi-digit whole number, a digit in any place represents $${\frac{1}{10}}$$ as much as it represents in the place to its left.

Common Core Standards


Core Standards

  • 5.NBT.A.1 — Recognize that in a multi-digit number, a digit in one place represents 10 times as much as it represents in the place to its right and 1/10 of what it represents in the place to its left.
  • 5.NBT.A.2 — Explain patterns in the number of zeros of the product when multiplying a number by powers of 10, and explain patterns in the placement of the decimal point when a decimal is multiplied or divided by a power of 10. Use whole-number exponents to denote powers of 10.

Foundational Standards

  • 4.NBT.A.1
  • 4.NF.B.4.B

Criteria for Success


  1. Divide whole numbers by 10 (e.g., $$5,000 \div 10$$, $$4,320 \div 10$$).
  2. Multiply whole numbers by $$\frac{1}{10}$$ or 0.1 and see that this is equivalent to dividing those whole numbers by 10. 
  3. Generalize the pattern that dividing a whole number by 10 results in the digits in the number shifting one place to the right (MP.8).
  4. Understand that a digit in one place represents $$\frac{1}{10}$$ of what it represents in the place to its left.

 

Tips for Teachers


Students will only divide in cases where the quotient is a whole number. Students will divide by 10 with decimal quotients in Topic B. 

Lesson Materials

  • Millions Place Value Chart (2 per student) — Students might need more or less depending on their reliance on this tool.
  • Base ten blocks (8 thousands, 80 hundreds, 70 tens, 50 ones per student or small group) — Students might not need these depending on their reliance on concrete materials. You could just use one set for the teacher if materials are limited.
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Anchor Tasks

25-30 minutes


Problem 1

a.   Solve. 

  1. $$50\div10=$$ ___________
  2. $$8,700\div 10=$$ ___________
  3. $$90,060 \div 10 =$$ ___________
  4. $$204,000 \div 10 =$$ ___________

b.   What do you notice about Part (a)? What do you wonder?

Guiding Questions

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Student Response

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Problem 2

a.    Solve.

  1. $${70 \div 10}$$
  2. $${70 \times {1\over 10}}$$
  3. $$70\times0.1$$

b.   What do you notice about Part (a)? What do you wonder?

Guiding Questions

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Student Response

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Problem 3

Write a whole number in which the value of the digit 3 is $$\frac{1}{10}$$ the value of the digit 3 in 23,456. Explain how you know the number you wrote is correct. 

Guiding Questions

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Student Response

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Problem Set

15-20 minutes


Discussion of Problem Set

  • Look at #1b. What did you get? (Note: They should have gotten 10 if they were paying close attention. Same with #2f.) 
  • Look at #5. Do you agree or disagree? If you agree, what are the two correct answers? Prove that they are both correct. 
  • Look at #7. What kind of picture did you draw? 

Target Task

5-10 minutes


Problem 1

Solve.

a.   $$380\div10=$$ ________

b.   $$4,820 \times \frac{1}{10}=$$ ________

Student Response

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Problem 2

Explain what happened to the value of the 8 in both problems in #1.

Student Response

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Additional Practice


The Extra Practice Problems can be used as additional practice for homework, during an intervention block, etc. Daily Word Problems and Fluency Activities are aligned to the content of the unit but not necessarily to the lesson objective, therefore feel free to use them anytime during your school day.

Word Problems and Fluency Activities

Word Problems and Fluency Activities

Help students strengthen their application and fluency skills with daily word problem practice and content-aligned fluency activities.

Next

Explain patterns in the number of zeros of the quotient when dividing a whole number by powers of 10.

Lesson 6
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Lesson Map

A7CB09C2-D12F-4F55-80DB-37298FF0A765

Topic A: Place Value with Whole Numbers

Topic B: Place Value with Decimals

Topic C: Reading, Writing, Comparing, and Rounding Decimals

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