lesson 2

Introduce Base-Ten Pieces

Est. Class Sessions: 3–4

Summarizing the Lesson

Guide students to a discussion of the benefits and advantages of the representation in which all trades have been made. Tell them this is what we call the Fewest Pieces Rule.

  • It has the fewest number of base-ten pieces.
  • You cannot make any more trades.
  • The number of skinnies and the number of bits gives you the number; e.g., 6 skinnies and 4 bits is 64.
  • There is only a single digit in each place.

Ask student pairs to go back to their Show Me the Number Recording Sheets and review the different drawings of the models. Ask them to draw a circle around all the drawings of models that use the Fewest Pieces Rule. Note that in some cases neither student may have used the fewest pieces possible to represent the number. In that situation, students should not circle either of the representations.

Play a few more rounds of the game. Model two different ways of partitioning each number shown on the spinners or have students draw the two different ways.

Then ask:

X
  • Which way uses fewer pieces?
  • How do you know? How can you show us? (I counted the pieces for both representations.)
  • Can you make any trades in this way of representing the number?
  • Is this the fewest pieces we could use to show this number?
  • Does this way use the Fewest Pieces Rule?

Draw a circle around the representations that show the fewest pieces.

Ask:

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  • What do you notice about the Fewest Pieces Rule and the way we write the number? (Each digit in the written number is the number of each kind of base-ten piece.)

Assign the How Many Bits pages in the Student Activity Book.

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Use the How Many Bits pages in the Student Activity Book to assess students' abilities to represent two-digit numbers using base-ten pieces [E1]; compose and decompose numbers using ones and tens [E2]; recognize different partition of numbers using base-ten pieces and number sentences [E3]; recognize that different partitions of the same number have the same total [E5]; and make connections between place value concepts and base-ten pieces [E4].

Adventure Book:
Student Activity Book: 279 280
Answers
X
SAB_Mini
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X
SAB_Mini
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Master:
Show Me the Number Recording Sheet with fewest pieces representations circled
X
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