1-3 Example 1 A tricycle has 3 wheels. How many wheels are on 7 tricycles? 1. Each tricycle has 3 wheels. Lesson 1-3 Example 1.

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Presentation transcript:

1-3 Example 1 A tricycle has 3 wheels. How many wheels are on 7 tricycles? 1. Each tricycle has 3 wheels. Lesson 1-3 Example 1

1-3 Example 1 A tricycle has 3 wheels. How many wheels are on 7 tricycles? 2. One rule is “add 3 for each tricycle.” 3 + 3 + 3 + 3 + 3 + 3 + 3 = 21 Lesson 1-3 Example 1

1-3 Example 1 A tricycle has 3 wheels. How many wheels are on 7 tricycles? 3. Another rule is “multiply by the number of tricycles by 3.” 7 × 3 = 21 Lesson 1-3 Example 1

1-3 Example 1 A tricycle has 3 wheels. How many wheels are on 7 tricycles? 4. No matter which rule is used, there are 21 wheels on 7 tricycles. Lesson 1-3 Example 1