Lesson 1

Number Sentences for Tile Designs

Est. Class Sessions: 2

Developing the Lesson

Part 2: Use Symbols to Compare Number Sentences

Write the following number sentences on a display:

  1. 6 + 4 8 + 3

  2. 3 + 9 6 + 6

  3. 9 + 7 7 + 7

Explain to students that they can make each number sentences true by using the equal sign or a different symbol.

Ask:

X
  • An equal sign shows that the two sides show the same amount. If the two sides are not equal, what other symbols could we use? (> or <)
  • How can we decide which symbol to use? (Find the answer for each side and decide if one side is greater than [>], less than [<], or equal to [=] to the other side.)

For each number sentence, ask students to discuss the following with a partner:

X
  • How can you make the number sentence true? (Place one of the following symbols in each
    circle: >, <, or =.)
  • How can you show that the symbol makes the number sentence true?

Encourage students to use tools and strategies to make each statement true. For example, for Sentence A, they can show that 6 + 4 is equal to 10 on the number line and 8 + 3 is equal to 11 on the number line. Since 10 is less than 11, they can use the symbol <.

As students explain their work, represent the addition on both sides of the circle as follows:

Have students work on the Compare Two Sides page in the Student Activity Book. Ask student pairs to determine if each sentence is true or false using strategies and tools. Have connecting cubes, ten frames, and number lines readily available.

ADVENTURE BOOK:
STUDENT ACTIVITY BOOK: 103
Answers
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SAB_Mini
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Master: