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To estimate a 20% tip on the dinner bill of $181.42, let's go through the steps outlined:

1. **Round the bill** to the nearest ten dollars. 
   - $181.42 rounds to $180 (nearest ten).

2. **Calculate 20% of the rounded amount**:
   \[
   20\% \text{ of } 180 = 0.20 \times 180 = 36
   \]

So, the estimated tip is **$36**.

Would you like further details on this calculation?

Here are five related questions to expand your understanding:
1. How would the tip change if we rounded to the nearest five dollars instead?
2. What if we needed to calculate a 15% or 25% tip instead of 20%?
3. How would you round the bill if it was $185.60?
4. Can you calculate the exact 20% tip without rounding the bill first?
5. Why might rounding be helpful in quick calculations?

**Tip:** Rounding can simplify mental calculations, but for precision, always work with the exact amount.

Estimate a 20% tip on a dinner bill of $181.42 by first rounding the bill amount to the nearest ten dollars.

Learn how to estimate a 20% tip on a $181.42 dinner bill by rounding to the nearest ten dollars. This solution guides through rounding and percentage calculations, ideal for students in Grades 5-7.

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