72.25+132.25+6.25+2.25+42.25+12.25+132.25+42.25+0.25+56.25+132.25+20.25+42.25+42.25+72.25+2.25+0.25+2.25+30.25+12.25

To calculate the sum of the given numbers:

### Numbers:
72.25 + 132.25 + 6.25 + 2.25 + 42.25 + 12.25 + 132.25 + 42.25 + 0.25 + 56.25 + 132.25 + 20.25 + 42.25 + 42.25 + 72.25 + 2.25 + 0.25 + 2.25 + 30.25 + 12.25

### Step-by-step Summation:
1. Grouping terms to simplify:
   \[
   (72.25 + 132.25 + 6.25 + 2.25 + 42.25 + 12.25) + (132.25 + 42.25 + 0.25 + 56.25 + 132.25) + (20.25 + 42.25 + 42.25 + 72.25 + 2.25 + 0.25 + 2.25 + 30.25 + 12.25)
   \]

2. Summing each group:
   - First group: \(72.25 + 132.25 + 6.25 + 2.25 + 42.25 + 12.25 = 267.5\)
   - Second group: \(132.25 + 42.25 + 0.25 + 56.25 + 132.25 = 363.25\)
   - Third group: \(20.25 + 42.25 + 42.25 + 72.25 + 2.25 + 0.25 + 2.25 + 30.25 + 12.25 = 224.25\)

3. Adding the results:
   \[
   267.5 + 363.25 + 224.25 = 855
   \]

### Final Answer:
\[
\boxed{855}
\]

Would you like a detailed breakdown of any step or further explanations? 😊

---

### Related Questions:
1. How can you simplify large sums using grouping?
2. What are the benefits of arranging numbers before summing?
3. How to identify patterns in a sequence of numbers for faster calculations?
4. What are the properties of addition that help in mental math?
5. Can we use rounding or estimation for approximate sums?

### Tip:
When adding many numbers, group them into sets that are easy to calculate, such as those forming round numbers (e.g., summing numbers that total 100).

Learn how to add a series of numbers efficiently using grouping and step-by-step summation. This problem demonstrates the application of the commutative and associative properties of addition. Suitable for students in Grades 4-6.

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