Selina solutions concise mathematics class 6 icse Solutions for Chapter 2 estimation

Exercises in Chapter 2 estimation Grade 6

Exercise 2(A)

Exercise 2(B)

Questions in Exercise 2(A)

Rounding off 6294 to the nearest ten is ________.

Round off 543 to the nearest ten.

Round off 8261 to the nearest ten.

Round off 62 to the nearest ten

Round off 266 to the nearest ten.

Q1) Round off each of the following to the nearest ten :

(i) 62

(ii) 265

(iii) 543

(iv) 8261

(v) 6294

(vi) 3008

(vii) 72326

Rounding off 3008 to the nearest ten is 3010.

Round off 72326 to the nearest ten is 72330.

Round off 2667 to the nearest hundred.

If we round off 784 to the nearest hundred, it is 800.

Rounding off 5432 to the nearest hundred is ________.

Rounding off 6388 to the nearest hundred would be 6300.

Round off 748 to the nearest hundred

Round off to the nearest hundred.

i) 59237

ii) 784

iii) 2667

iv) 5432

v) 6388

Rounding off 5352 to the nearest thousand is 6000.

Round off 6732 to the nearest thousand.

Q3) Round off each of the following to the nearest thousand :

(i) 6475

(ii) 6732

(iii) 5352

(iv) 32568

(v) 9248

(vi) 83294

Round off 6475 to the nearest thousand.

Rounding off 9248 to the nearest thousand is 9000.

Rounding off 83294 to the nearest thousand is _____.

Round off 32568 to the nearest thousand.

State whether the following statement is TRUE or FALSE:

Rounding off 578 to the nearest hundred is 580.

Q4) Round off:

(i) 578 to the nearest ten.

(ii) 578 to the nearest hundred.

(iii) 4327 to the nearest thousand.

(iv) 32974 to the nearest ten-thousand.

(v) 27487 to the nearest ten-thousand.

Rounding off 32974 to the nearest ten-thousand is _________

Rounding off 578 to the nearest ten is ______.

Rounding off 4327 to the nearest thousand is ____

State whether the following statement is TRUE or FALSE:

Rounding off 27487 to the nearest ten-thousand is 30000.

Q5) Round off each of the following to the nearest tens, hundreds and thousands.

(i) 864

(ii) 1249

(iii) 54,547

(iv) 68,076

(v) 56,293

(vi) 7,293

(vii) 89,24,379

Rounding off Rs. 27 to the nearest tens is Rs. ________.

Q6) Round off the following to the nearest tens ;

(i) Rs. 562

(ii) 837 m

(iii) 545 cm

(iv) Rs. 27

State whether the following statement is TRUE or FALSE:

Rounding off 545 cm to the nearest tens is 550 cm.

Rounding off 837 m to the nearest tens is ___________ m

Rounding off Rs. 562 to the nearest tens is Rs. _______.

Q7) List all the numbers which can be round off to 30.

List of all the numbers which can be round off to 30 is:

26, 27, 28, 29, 31, 32, 33, 34.

Q8) List all the numbers which can be rounded off to 50.

The list of all the numbers which can be rounded off to 50 is:

46, 47, 48, 49, 51, 52, 53, 54.

Q9) Write the smallest and the largest numbers which are rounded off to 130.

Select the smallest and the largest numbers which are rounded off to 130.

Questions in Exercise 2(B)

Estimate the sum of pair of numbers 527 and 267 to the nearest ten.

Estimate the sum of pair of numbers 474 and 173 to the nearest ten.

Estimate the sum of pairs of numbers 457 and 175 to the nearest ten.

Estimate the sum of pair of numbers 23 and 66 to the nearest ten.

Estimate the sum of pairs of numbers 76 and 62 to the nearest ten.

The sum of the pair of numbers 96 and 55 to the nearest ten is 150.

The sum of pair of 34 and 87 numbers to the nearest ten is _______.

Estimate the sum of below pair of numbers to the nearest ten :

67 and 44

Q1) Estimate the sum of each pair of numbers to the nearest ten :

(i) 67 and 44

(ii) 34 and 87

(iii) 23 and 66

(iv) 78 and 18

(v) 96 and 55

(vi) 76 and 62

(vii) 457 and 175

(viii) 474 and 173

(ix) 527 and 267

Estimate the sum of pair of numbers 78 and 18 to the nearest ten.

Estimate the sum of 546 and 342 to the nearest hundred.

The sum of 30047 and 39287 to the nearest hundred is ______.

Q2) Estimate the sum of each pair of numbers to the nearest hundred :

(i) 336 and 782

(ii) 546 and 342

(iii) 270 and 495

(iv) 4280 and 5295

(v) 4230 and 2410

(vi) 30047 and 39287

Estimate the sum of 4230 and 2410 to the nearest hundred.

Estimate the sum of 4280 and 5295 to the nearest hundred.

Estimate the sum of 270 and 495 to the nearest hundred is 800.

Estimate the sum of 336 and 782 to the nearest hundred.

Estimate the sum of 53826 and 36455 to the nearest thousand.

Q3)Estimate the sum of the following pair of numbers to the nearest thousand:

(i) 53826 and 36455

(ii) 56802 and 22475

Estimate the sum 56802 and 22475 to the nearest thousand.

Estimate the difference correct to nearest ten: 96 – 36

Q4) Estimate the following differences correct to nearest ten :

(i) 82 – 27

(ii) 96 – 36

(iii) 508 – 248

The differences 82 – 27 to the nearest tens is ____.

Estimate the difference correct to the nearest ten: 508 – 248

Q5) Estimate each difference to the nearest hundred :

(i) 769 – 314

(ii) 856 – 687

(iii) 6352 – 2086

Estimate the difference to the nearest hundred 6352 – 2086.

Estimate the difference to the nearest hundred :

769 – 314

Estimate t difference to the nearest hundred: 856 – 687

Estimate difference to the nearest thousand: 45974 – 38766

Q6) Estimate each difference to the nearest thousand :

(i) 45974 – 38766

(ii) 76003 – 48399

Estimate the difference to the nearest thousand : 76003 – 48399

The estimate of the product, $25\times33$ by rounding off each number to the nearest ten is 825.

Estimate the following products by rounding off nearest to the ten : $49\times52$

Estimate the product by rounding off each number to the nearest ten : $53\times85$

Estimate the product by rounding off the numbers to the nearest ten : $27\times54$

Estimate products by rounding off number to the nearest ten : $63\times38$

Estimate the product by rounding off each number to the nearest ten : $74\times67$

Q7) Estimate each of the following products by rounding of each number to the nearest ten : (i) $49\times52$

(ii) $63\times38$

(iii) $27\times54$

(iv) $53\times85$

(v) $74\times67$

(vi) $25\times33$

Q8) Estimate each of the following products by rounding off each number to the nearest hundred : (i) $477\times213$

(ii) $624\times236$

(iii) $333\times247$

(iv) $537\times283$

(v) $382\times127$

(vi) $427\times328$

Estimate the product $427\times328$ by rounding off each number to the nearest hundred.

Estimate the product $382\times127$ by rounding off each number to the nearest hundred.

Estimate the following products by rounding off each number to the nearest hundred: $537\times283$

Estimate the product by rounding off each number to the nearest hundred: $624\times236$

Estimate the product by rounding off each number to the nearest hundred: $477\times213$

Estimate the product by rounding off each number to the nearest hundred: $333\times247$

Q9) Estimate each of the following products by rounding off the first number correct to nearest ten and the other number correct to nearest hundred : (i) $28\times287$

(ii) $432\times128$

(iii) $48\times165$

(iv) $72\times258$

(v) $83\times664$

(vi) $44\times250$

Estimate the product $72\times258$ rounding off the first number correct to the nearest ten and the other number correct to the nearest hundred.

Estimate the product $432\times128$ by rounding off the first number correct to the nearest ten and the other number correct to the nearest hundred.

Estimate the product $48\times165$ by rounding off the first number correct to nearest ten and the other number correct to nearest hundred :

Estimate the products $83\times664$ by rounding off the first number correct to the nearest ten and the other number correct to the nearest hundred.

Estimate the product $44\times250$ by rounding off the first number correct to the nearest ten and the other number correct to the nearest hundred.

Estimate products by rounding off the first number correct to the nearest ten and the other number correct to the nearest hundred $28\times287$ .

Estimate the quotients by converting each number to the nearest ten: $843\div33$

Q10) Estimate each of the following quotients by converting each number to the nearest ten :

(i) $87\div28$

(ii) $84\div23$

(iii) $77\div22$

(iv) $198\div24$

(v) $355\div26$

(vi) $444\div42$

(vii) $843\div33$

Estimate the quotients by converting each number to the nearest ten: $198\div24$

The quotients $84\div23$ by converting each number to the nearest ten is ...

Estimate the quotients by converting each number to the nearest ten :

$77\div22$

Estimate the quotient by converting each number to the nearest ten. $87\div28$

The quotient $355\div26$ by converting each number to the nearest ten is 12.

The quotients of $444\div42$ by converting each number to the nearest ten is ____.

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Chapters in this book

Number System (Consolidating the Sense of Numberness)

Estimation

Numbers in India and International System (With Comparison)

Place Value

Natural Numbers and Whole Numbers (Including Patterns)

Negative Numbers and Integers

Number Line

HCF and LCM

Playing with Numbers

Sets

Ratio

Proportion (Including Word Problems)

Unitary Method

Fractions

Decimal Fractions

Percent (Percentage)

Idea of Speed, Distance and Time

Fundamental Concepts (Algebra)

Fundamental Operations (Related to Algebraic Expressions)

Substitution (Including Use of Brackets as Grouping Symbols)

Framing Algebraic Expressions (Including Evaluation)

Simple (Linear) Equations (Including Word Problems)

Fundamental Concepts (Geometry)

Angles (With their Types)

Properties of Angles and Lines (Including Parallel Lines)

Triangles (Including Types, Properties and Construction)

Quadrilateral

Polygons

The Circle

Revision Exercise on Symmetry (Including Constructions on Symmetry)

Recognition of Solids

Perimeter and Area of Plane Figures

Data Handling (Including Pictograph and Bar Graph)

Mean and Median