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The problem states that Min-jun is loading shirts onto 42 planes, with each plane holding 8 shirts. The task is to choose the best estimate for the total number of shirts.

To find the exact number of shirts, we multiply:

\[
42 \times 8 = 336
\]

Now, let's look at the provided expressions, which are estimates based on rounding 42:

- \( 20 \times 8 = 160 \)
- \( 30 \times 8 = 240 \)
- \( 40 \times 8 = 320 \)
- \( 50 \times 8 = 400 \)

Since 42 is closest to 40, the best estimate is \( 40 \times 8 = 320 \), which is reasonably close to the exact value of 336.

Thus, the correct answer is **40 × 8**.

Would you like more details on this? Here are some related questions to consider:
1. How do you determine when it's appropriate to estimate instead of calculating the exact value?
2. What are the benefits of rounding to the nearest 10 in this context?
3. What if the planes could hold more or fewer shirts? How would the estimates change?
4. Can we create a method to always get the best possible estimate?
5. How can you check if your estimate is reasonably close to the actual value?

**Tip:** When estimating, try rounding numbers to values that are easier to compute mentally, while ensuring the estimate remains close to the actual value.

Min-jun is loading shirts on to 42 planes for shipment. Each plane can hold 8 shirts. Which expression can be used to best estimate the total number of shirts being shipped? Options: 20 × 8, 30 × 8, 40 × 8, 50 × 8.

Learn how to estimate the total number of shirts loaded onto 42 planes, each holding 8 shirts. This problem demonstrates basic multiplication and rounding techniques suitable for Grade 4-6 students.

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