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Does 10 Really Equal 10?

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Format: whole group and partners

SOL Objectives:1.18 The student will demonstrate an understanding of equality through the use of the equal

sign.

Related SOL: 1.5

Vocabulary: equality (=), equations, equal

Teacher Preparation:

Prepare and set up Number Math BalancesEqual Schmequal Game boards and card sets

(1 set for each pair of students)Copies of Does It Balance?

Materials: Equal Schmequal by Virginia Kroll, chart paper, Number Math Balance

Time Required: 60 minutes

Directions:1. Read Equal Schmequal and discuss how the animals needed to create a balance on both sides of

the rope and/or seesaw for the game to fair, equal, or balanced.2. After reading the story, give each student a post-it note. Ask each student to show you a way to

make 10 on their post-it note. Leave the directions somewhat open to see how students think aboutthe number 10. Students may draw 10 tally marks and/or write a number sentence (8+2 or 12-2,etc.). On a piece of chart paper title Ways to Make 10, have the student come up and post their wayfor making 10.

3. Choose 2 of the number sentences students wrote and prove that both equal 10 by using the NumberMath Balance. If both number sentences equal 10 record the number sentences on chart paper. For

example, if the students created 5 + 5 and 3+7, write5 + 5 = 3+7.

4. Repeat step 3 a couple times so students begin to recognize the relationship between twoexpressions of equal value. Students will also begin to acknowledge the =s sign doesnt mean theanswer. Make sure to throw in a number sentence that DOES NOT balance to show students thenumber on both sides may not equal which makes the number sentence not true.

5. Pick another number and have students create number sentences that would equal the numberchosen. Have students use the Number Balance to prove the number sentences are equal.

6. Introduce the game Equal Schmequal. Directions are at the top of the game pieces. Model thegame with a student and then have students partner up to play the game. Observe students whileplaying the game to check for understanding.

7. For assessment, see Does It Balance. While students complete this, encourage them to use theBalance Scales to prove their thinking.

Exploration Questions:Does the equals sign always mean the answer?What are some new ways you learned to make 10 today?Did you find any number sentences that werent true. What did that look like on the Number Balance?

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Equal SchmequalThis game is for 2 players.

DIRECTIONS:

Cut out the playing cards below and the scoreboard on page 107.

Turn the playing cards upside down and mix them up.

Take turns drawing one card at a time.

If you have two cards with equal amounts, put them in two of the boxes on your scoreboard.

If you have two cards with unequal amounts, place them facedown in their original

positions.

The first player to fill up all of the boxes on her/his scoreboard wins.]

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10 + 0 1 + 9 6 + 4 3 + 7

8 + 2 5 + 5 0 + 10 9 + 1

4 + 6 7 + 3 2 + 8 1 + 10

2 + 9 3 + 8 5 + 4 7 + 4

11 - 2 11 1 10 - 1 7 + 2

12 - 2 2 + 7 8 + 3 1 - 11

Equal Schmequal Game

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Name ________________________________ Date _________________________

Make 8!Quick Assessment

Cut out the number sentences below. Glue them on your paper to make true statements

that make 8. Use the Number Balance to prove your number sentences show equality!

=1.

=2.

=3.

=4.

=5.

=6.

This number sentence is NOT TRUE!

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4 + 4 8 - 4 1 + 7 8 + 1

6 + 2 5 + 3 9 - 1 10 - 2

2 - 10 2 + 6 3 + 5 7 + 1

1 + 8 0 + 8 8 + 0 12 - 4