Estimating decimal answers is a super useful skill! Instead of calculating the exact answer, you round the decimals to whole numbers or simpler decimals that are easy to work with in your head. This helps you quickly check if your actual calculations are reasonable and avoid big mistakes. Think of it as a quick sanity check for your math!
For example, if you have $3.89 + 2.22$, you could round $3.89$ to $4$ and $2.22$ to $2$. Then, $4 + 2 = 6$, so your estimated answer is $6$. This tells you that the real answer should be somewhere close to $6$.
Match the term with its correct definition:
| Term | Definition |
|---|---|
| 1. Decimal | a. A number that is close to the exact value. |
| 2. Estimate | b. To find a value that is close enough to the right answer. |
| 3. Rounding | c. A number that uses a decimal point to show values less than one. |
| 4. Whole Number | d. Adjusting a number to a nearby value according to a specific rule. |
| 5. Approximation | e. A number without fractions or decimals; an integer greater than or equal to zero. |
When we estimate decimal answers, we often use the process of __________. This involves changing the decimal numbers to easier numbers like __________ numbers. For example, if we want to estimate $7.6 + 2.1$, we can round $7.6$ to __________ and $2.1$ to __________. The estimated sum is then __________. Estimating helps us check the __________ of our calculations.
Why is estimating decimal answers a useful skill in everyday life? Give at least two examples.
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