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Chapter 8: Problem 11

Use the clustering method to estimate each sum. Results may vary. $$ 89+32+89+93 $$

Short Answer

Expert verified
The estimated sum is about 300.

Step by step solution

01

Round Numbers to Nearest Tens

To make estimation easier, round the numbers to the nearest tens. - 89 rounds to 90 - 32 rounds to 30 - 89 rounds to 90 - 93 rounds to 90
02

Group Similar Numbers

Group the numbers that are similar or identical. Here, we have 90, 90, and 90 three times: - Single number: 30 - Three numbers: 90, 90, 90
03

Calculate Sum of Each Group

Sum each group separately:- Calculate the sum of 90, 90, and 90: \[90 + 90 + 90 = 270\]- Add the individual number, 30:\[270 + 30 = 300\]
04

Estimate the Total Sum

Combine the results from Step 3 to estimate the total sum. The estimated sum is approximately 300.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Rounding Numbers
When estimating sums, the first step usually involves rounding numbers. Rounding is essentially simplifying a number to make calculations easier and is especially handy in mental math. For instance, if you have the number 89, you would round it to 90 when rounding to the nearest ten. The general rule for rounding is:
  • If the digit to the right of your rounding digit is 5 or more, round up.
  • If it's less than 5, round down.
Applying this to our numbers:
  • 89 rounds up to 90 because the next digit (9) is greater than 5.
  • 32 rounds to 30, since 2 is less than 5.
  • Another 89 again rounds to 90.
  • Finally, 93 rounds to 90, as the 3 is less than 5.
Rounding makes numbers easier to deal with, leading to simpler and quicker calculations.
Estimation in Mathematics
Estimation is a valuable skill in mathematics as it helps to quickly gauge what a number should roughly be. This technique saves effort and time, especially when dealing with large data sets or needing quick answers. To use estimation effectively, you can follow this process:
  • Rounding Numbers: First, round the numbers as mentioned earlier to simplify calculations.
  • Clustering Method: This involves grouping similar amounts together. For example, with our numbers, we grouped them into 90, 90, 90, and a single 30.
By doing this, you effortlessly get to a close approximation of the sum by adding up these grouped values, arriving at a reasonable estimate without the need for exact computation. The resulting sum, in our case, was approximately 300.
Addition Strategies
To effectively add numbers, especially after rounding them, you can use various strategies. The clustering method helps in organizing numbers for easier addition. Here鈥檚 how you can approach it:
  • First, after rounding, look for numbers that are identical or similar, and add those together. In our sum calculation, 90 repeated itself, so we grouped them together and calculated: \[90 + 90 + 90 = 270\]
  • Next, add any remaining single numbers to the resulting sum of the grouped numbers. Here, we had a leftover 30, which we added to 270: \[270 + 30 = 300\]
This two-step approach ensures that you manage addition problems in manageable chunks, promoting accuracy while keeping the process straightforward and easy to follow. Different strategies, like breaking numbers into tens and ones, or using mental math tricks, can further aid in making addition a breeze.

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Most popular questions from this chapter

(Section 6.3) Convert 0.06 to a fraction.

Estimate each calculation using the method of rounding. After you have made an estimate, find the exact value and compare this to the estimated result to see if your estimated value is reasonable. Results may vary. $$ 611+806 $$

Estimate each sum or difference using the method of rounding. After you have made an estimate, find the exact value of the sum or difference and compare this result to the estimated value. Result may vary. \(\frac{9}{10}+2 \frac{3}{8}\)

Estimate each value using the method of rounding. After you have made an estimate, find the exact value. Compare the exact and estimated values. Results may vary. $$ 2,703 \div 53 $$

Use the distributive property to compute each product. \(15 \cdot 107\)
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