📚 Topic Summary
Estimating differences in third-grade math involves finding an approximate answer to a subtraction problem. Instead of calculating the exact difference, you round the numbers to the nearest ten or hundred to make the subtraction easier and faster. This is helpful when you need a quick estimate in real-life situations, like figuring out if you have enough money to buy something or how much time is left for an activity.
🧮 Part A: Vocabulary
Match the following terms with their definitions:
| Term |
Definition |
| 1. Estimate |
A. The amount left after subtraction. |
| 2. Difference |
B. To find a value that is close to the exact answer. |
| 3. Rounding |
C. Changing a number to the nearest ten, hundred, etc. |
| 4. Subtraction |
D. Taking away one number from another. |
| 5. Approximate |
E. Close to the actual, but not exact. |
✍️ Part B: Fill in the Blanks
When we ___________, we find a number that is close to the exact amount. To estimate the ___________ between two numbers, we can _______ each number to the nearest ten or hundred. This makes the ___________ problem easier to solve in our heads. Estimation is useful in __________ life when we need quick answers.
🤔 Part C: Critical Thinking
Why is estimating differences a useful skill to have, even if you have a calculator?