Rounding puzzles
Welcome to Rounding Escape Room. Use clues to figure out mystery numbers by thinking backward from rounded results.
Concept
In a rounding puzzle, you know the rounded answer and must find numbers that fit. šµļø **Puzzle Thinking:** If a number rounds to **5,000** (nearest thousand), then the original number must be between: - **4,500** and **5,499** Why? - 4,500 is the first number that rounds up to 5,000 - 5,499 is the last number that still rounds down to 5,000 šÆ **Another one:** Rounds to 320 (nearest ten) means the number is from 315 to 324. š Rounding puzzles build flexible thinking: - forward rounding - backward reasoning - checking boundaries
Try it
Solve the puzzle clues. 1. I round to 8,000 to the nearest thousand. My hundreds digit is 7. Name one possible number. 2. I round to 46,000 to the nearest thousand. What is the smallest possible number? 3. I round to 46,000 to the nearest thousand. What is the largest possible number? 4. I round to 590 to the nearest ten. Give two possible numbers. 5. I round to 300,000 to the nearest hundred thousand and I am less than 250,000. What is one possibility? š Challenge: 6. Find all whole numbers that round to 120 (nearest ten).