- Ordering Rounding and Order of Operations
- Home
- Introduction to Inequalities
- Comparing a Numerical Expression With a Number
- Ordering Large Numbers
- Rounding to Tens or Hundreds
- Rounding to Hundreds or Thousands
- Rounding to Thousands, Ten Thousand, or Hundred Thousand
- Estimating a Sum of Whole Numbers
- Estimating a Difference of Whole Numbers
- Estimating a Product of Whole Numbers
- Estimating a Quotient of Whole Numbers
- Writing Expressions Using Exponents
- Introduction to Exponents
- Power of 10: Positive Exponent
- Power of 10: Negative Exponent
- Introduction to Parentheses
- Comparing Numerical Expressions With Parentheses
- Introduction to Order of Operations
- Order of Operations With Whole Numbers
- Order of Operations With Whole Numbers and Grouping Symbols
- Order of Operations With Whole Numbers and Exponents: Basic

- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who

Following quiz provides Multiple Choice Questions (MCQs) related to **Estimating a Sum of Whole Numbers**. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using **Show Answer** button. You can use **Next Quiz** button to check new set of questions in the quiz.

Q 1 - Estimate the sum 343 + 5,209 + 148, by first rounding each number to the nearest hundred.

**Step 1:**

As 4 < 5

343 estimated to nearest hundred is 300

**Step 2:**

As 0 < 5

5209 estimated to nearest hundred is 5200

**Step 3:**

As 4 < 5

148 estimated to nearest hundred is 100

**Step 4:**

So the estimated sum by rounding each number to the nearest hundred is

300 + 5,200 + 100 = 5,600

Q 2 - Estimate the sum 553 + 2,841 + 751, by first rounding each number to the nearest hundred.

**Step 1:**

As tens digit is 5

553 estimated to nearest hundred is 600

**Step 2:**

As 4 < 5

2841 estimated to nearest hundred is 2800

**Step 3:**

As tens digit is 5

751 estimated to nearest hundred is 800

**Step 4:**

So the estimated sum by rounding each number to the nearest hundred is

600 + 2,800 + 800 = 4,200

Q 3 - Estimate the sum 6,432 + 2,529 + 12,126, by first rounding each number to the nearest thousand

**Step 1:**

As 4 < 5

6432 estimated to nearest thousand is 6000

**Step 2:**

As hundreds digit is 5

2529 estimated to nearest thousand is 3000

**Step 3:**

As 1 < 5

12,126 estimated to nearest thousand is 12,000

**Step 4:**

So the estimated sum by rounding each number to the nearest thousand is

6,000 + 3,000 + 12,000 = 21,000

Q 4 - Estimate the sum 2,732 + 5,681 + 18,401, by first rounding each number to the nearest thousand

**Step 1:**

As 7 > 5

2732 estimated to nearest thousand is 3000

**Step 2:**

As 6 > 5

5681 estimated to nearest thousand is 6000

**Step 3:**

As 4 < 5

18,401 estimated to nearest thousand is 18,000

**Step 4:**

So the estimated sum by rounding each number to the nearest thousand is

3,000 + 6,000 + 18,000 = 27,000

Q 5 - Estimate the sum 8,332 + 1,783 + 10,006, by first rounding each number to the nearest thousand

**Step 1:**

As 3 < 5

8332 estimated to nearest thousand is 8000

**Step 2:**

As 7 > 5

1783 estimated to nearest thousand is 2000

**Step 3:**

As 0 < 5

10,006 estimated to nearest thousand is 10,000

**Step 4:**

So the estimated sum by rounding each number to the nearest thousand

8,000 + 2,000 + 10,000 = 20,000

Q 6 - Estimate the sum 3,723 + 683 + 945, by first rounding each number to the nearest hundred.

**Step 1:**

As 2 < 5

3723 estimated to nearest hundred is 3700

**Step 2:**

As 8 > 5

683 estimated to nearest hundred is 700

**Step 3:**

As 4 < 5

945 estimated to nearest hundred is 900

**Step 4:**

So the estimated sum by rounding each number to the nearest hundred is

3,700 + 700 + 900 = 5,300

Q 7 - Estimate the sum 218 + 3,617 + 469, by first rounding each number to the nearest hundred.

**Step 1:**

As 1 < 5

218 estimated to nearest hundred is 200

**Step 2:**

As 1 < 5

3617 estimated to nearest hundred is 3600

**Step 3:**

As 6 > 5

469 estimated to nearest hundred is 500

**Step 4:**

The estimated sum by rounding each number to the nearest hundred is

So 200 + 3,600 + 500 = 4,300

Q 8 - Estimate the sum 590 + 675 + 1,628, by first rounding each number to the nearest hundred.

**Step 1:**

As 9 > 5

590 estimated to nearest hundred is 600

**Step 2:**

As 7 > 5

675 estimated to nearest hundred is 700

**Step 3:**

As 2 < 5

1628 estimated to nearest hundred is 1600

**Step 4:**

The estimated sum by rounding each number to the nearest hundred is

600 + 700 + 1,600 = 2,900

Q 9 - Estimate the sum 2,516 + 6,341 + 1,450, by first rounding each number to the nearest thousand

**Step 1:**

As hundreds digit is 5

2516 estimated to nearest thousand is 3000

**Step 2:**

As 3 < 5

6341 estimated to nearest thousand is 6000

**Step 3:**

As 4 < 5

1450 estimated to nearest thousand is 1000

**Step 4:**

So the estimated sum by rounding each number to the nearest thousand is

3,000 + 6,000 + 1,000 = 10,000

Q 10 - Estimate the sum 8,439 + 5,816 + 7,121, by first rounding each number to the nearest thousand.

**Step 1:**

As 4 < 5

8439 estimated to nearest thousand is 8000

**Step 2:**

As 8 > 5

5816 estimated to nearest thousand is 6000

**Step 3:**

As 1 < 5

7121 estimated to nearest thousand is 7000

**Step 4:**

So the estimated sum by rounding each number to the nearest thousand is

8,000 + 6,000 + 7,000 = 21,000

estimating_sum_of_whole_numbers.htm

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