Estimating is like making a smart guess! It helps us check if our answers to math problems are reasonable. When we estimate, we round numbers to the nearest ten or hundred, making it easier to do the math in our heads. This way, we can quickly see if our final answer is in the right ballpark. It's a great way to catch mistakes and build confidence in our math skills!
For example, if you're adding 27 + 42, you can round 27 to 30 and 42 to 40. Then, 30 + 40 = 70. So, your estimated answer is 70. When you actually add 27 + 42, you get 69. Because 69 is close to 70, your answer is probably right!
Match the word with its correct definition:
| Word | Definition |
|---|---|
| 1. Estimate | a) The process of finding a value that is close to the correct answer. |
| 2. Rounding | b) To change a number to the nearest ten, hundred, thousand, etc. |
| 3. Sum | c) The answer to an addition problem. |
| 4. Difference | d) The answer to a subtraction problem. |
| 5. Reasonable | e) Makes sense; logical. |
Use the words estimate, rounding, and reasonable to complete the sentences.
Explain in your own words why estimating is a useful skill when solving math problems. Give an example to support your answer.
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