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Chapter 8: Problem 13

Estimate the sum: \(61.02+26.8\).

Short Answer

Expert verified
The estimated sum is 88.

Step by step solution

01

Round Each Number to the Nearest Whole Number

Start by rounding each of the numbers involved in the sum to the nearest whole number. For 61.02, the nearest whole number is 61 because the decimal point is less than 0.5. For 26.8, the nearest whole number is 27, as its decimal is greater than or equal to 0.5.
02

Add the Rounded Numbers

Now add the rounded numbers. Take 61 and 27 and add them together: \[ 61 + 27 = 88 \]
03

Verify the Estimate

This step involves considering if the rounded numbers are reasonably close to the original numbers. The rounding in step 1 was done to the nearest whole number, so our estimated sum of 88 should be fairly close to the exact sum. This gives confidence in the estimation process.

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Key Concepts

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

Rounding Numbers
Rounding numbers helps make calculations quicker and simpler. It's like finding the closest 'friendly' number to work with. For example, if you have the number 61.02, rounding simplifies it to 61, since 0.02 is less than halfway to the next whole number. The rule of thumb is:
  • If the decimal is less than 0.5, round down.
  • If the decimal is 0.5 or more, round up.
This rule makes it easy to judge which whole number to use. It reduces complex decimals into easy-to-handle figures, especially useful when estimating large sums.
Whole Numbers
Whole numbers are numbers without fractions or decimals. They include zero and all positive integers, like 0, 1, 2, 3, and so on. When dealing with operations like estimation, whole numbers provide a simplified form that facilitates mental calculations. In our exercise, both 61.02 and 26.8 are rounded to the nearest whole numbers, 61 and 27 respectively. This can make adding them easier and faster compared to their original decimal forms. Focusing on whole numbers can sometimes cause a slight loss in precision, but they offer an efficient way to perform quick calculations.
Addition of Decimals
Adding decimals directly gives precise results but requires careful alignment of decimal points. Compared to whole numbers, decimals may seem daunting, but here鈥檚 a simple process:
  • Align the decimal points vertically.
  • Fill any empty spaces with zeroes for uniformity.
  • Proceed with addition as you do with whole numbers.
In contrast, when rounding is used as demonstrated in the exercise, it becomes more about getting a ballpark figure, which can be ideal in real-world situations where exact numbers aren鈥檛 crucial. Estimating by rounding can provide a swift and practical solution for quick, everyday calculations.

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Most popular questions from this chapter

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. $$ 3,344 \div 76 $$

Estimate each value. After you have made an estimate, find the exact value. Results may vary. \((\) Section 8.2\() 82 \cdot 38\)

For problems 1 - 16 , estimate each value. After you have made an estimate, find the exact value. Results may vary. (Section 8.2) \(3,716+6,789\)

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. \(62.91+56.4\)

Estimate each value using the method of clustering. After you have made an estimate, find the exact value. Compare the exact and estimated values. Results may vary. $$ 81+41+92+38+88+80 $$
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