Subscribe to our YouTube channel for the latest videos, updates, and tips.
Estimation in Operations on Numbers
To estimate sum and difference, we first round off each number to the nearest tens, hundreds, thousands or millions and then apply the required mathematical operation.
Solved example on Estimation in Operations on Numbers:
1. Find the actual and estimated sum of 126,289 and 375,484 by rounding off numbers to the nearest thousands.
Solution:
To round off to the nearest thousands place, we consider the number at ten-thousands place. Let us see the position of 126,289 on the number line.
We observe that 126,289 is closer to 100,000. Therefore, it is rounded down to 100,000. Next, we check the position of 375,484 on the number line.
We note that 375,484 is closer to 400,000. Therefore, it is rounded up to 400,000.
To find the estimated product or quotient, we round off numbers to the greatest place-value.
2. Find the actual and estimated product of 22,165 and 3,745 by rounding off numbers to the greatest place-value.
Solution:
22,165 is rounded off to the nearest ten-thousands. 3745 is rounded off to the nearest thousands.
3. Estimate the quotient for 7,475 ÷ 510
Solution:
7,475 is rounded off to the nearest thousands
510 is rounded off to the nearest hundreds
7,475 is closer to 7,000
510 is closer to 500
So, 7,000 ÷ 500 = 14
Questions and Answers on Estimation in Operations on Numbers:
I. Estimate the given numbers and find the answer:
Answer:
II. Estimate and choose the right answer:
1. A shopkeeper has 93,450 packets to sketch pens. If each packet has 12 pens, then how many sketch pens are there in the shop.
(i) 900,000
(ii) 9,540,000
Answer: 900,000
2. Shelly has 6,782,344 mm of rope. She has another rope of length 2,539,886 mm. If both the ropes are attached, the estimated length nearest to 1000 will be
(i) 9,450,000
(ii) 9,322,000
Answer: 9,322,000
3. There are 1341 houses in a street. Each house uses 278 units of electricity energy. Estimated energy used by the houses nearest to 10 will be
(i) 375,200
(ii) 37,500
Answer: 375,200
5th Grade Math Problems
From Estimation in Operations on Numbers to HOME PAGE
Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.
Recent Articles
-
Worksheet on Rounding Decimals | Questions Related to Round a Decimal
May 14, 25 04:21 PM
The worksheet on rounding decimals would be really good for the students to practice huge number of questions related to round a decimal. This worksheet include questions related -
Rounding Decimals | How to Round a Decimal? | Rounding off Decimal
May 14, 25 03:01 PM
Rounding decimals are frequently used in our daily life mainly for calculating the cost of the items. In mathematics rounding off decimal is a technique used to estimate or to find the approximate -
Worksheet on Rounding Off Number | Rounding off Number | Nearest 10
May 14, 25 12:50 PM
In worksheet on rounding off number we will solve 10 different types of problems. 1. Round off to nearest 10 each of the following numbers: (a) 14 (b) 57 (c) 61 (d) 819 (e) 7729 2. Round off to -
Rounding Off to the Nearest Whole Number | Nearest 10, 100, and 1000
May 13, 25 03:43 PM
Here we will learn how to rounding off to the nearest whole number? -
Conversion of Improper Fractions into Mixed Fractions |Solved Examples
May 12, 25 04:52 AM
In conversion of improper fractions into mixed fractions, we follow the following steps: Step I: Obtain the improper fraction. Step II: Divide the numerator by the denominator and obtain the quotient…
New! Comments
Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.