Randy wants to save $21 to buy a basketball. He saves $7 each week. Which array represnts the number of weeks Randy needs to save $21?

To solve this, we can model the problem with an array that represents how much Randy saves each week, and determine how many weeks it takes for him to reach $21.

### Understanding the problem:
- Randy saves $7 per week.
- He wants to save a total of $21.
- We need to find how many weeks it takes to reach $21.

Now, let's break it down in terms of savings per week:

- After Week 1: $7 saved
- After Week 2: $7 + $7 = $14 saved
- After Week 3: $7 + $7 + $7 = $21 saved

Thus, it takes **3 weeks** to save $21. The array representing the savings per week would be:

\[ [7, 14, 21] \]

Each element in this array corresponds to Randy’s cumulative savings after each week.

Would you like further details or have any questions? Here are 5 related questions for deeper understanding:

1. How can you express this problem as a multiplication equation?
2. What is the relationship between the total amount saved and the number of weeks?
3. What would happen if Randy saved $5 per week instead of $7? How many weeks would it take?
4. If Randy wanted to save $35, how many weeks would it take at $7 per week?
5. What other strategies could Randy use to save money faster?

**Tip**: When dealing with problems involving equal groups, arrays can visually represent cumulative totals, helping to solve multiplication problems easily.

Randy wants to save $21 to buy a basketball. He saves $7 each week. Which array represents the number of weeks Randy needs to save $21?

Explore how Randy saves $7 each week to reach his $21 goal. This problem demonstrates multiplication and cumulative addition concepts, showing how to model savings with an array. Ideal for students in Grades 4-6.

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