Tag: maths

Quizzes (518) Questions (9324)

Questions Related to maths

Multiple choice maths mental arithmetic estimation and rounding off estimations, bounds and rounding off rounding off numbers rounding of decimals

Round-off $76,890$ to nearest $10$.

  1. $76,890$
  2. $76,880$
  3. $76,900$
  4. $77,000$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$\Rightarrow$   The given number is $76,890$.

$\Rightarrow$   In number 76890, its unit digit is $0$, which is already nearest to 10.
$\Rightarrow$  So, don't need to change anything.
$\therefore$   $76,890$ is nearest to 10.

Multiple choice maths mental arithmetic estimation and rounding off estimations, bounds and rounding off rounding off numbers rounding of decimals

Round-off $4353$ to nearest $100$.

  1. $4353$
  2. $4350$
  3. $4360$
  4. $4400$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$\Rightarrow$  The given number is $4353$

$\Rightarrow$  In number 4353, its tens digit is 5, which is equal to 5. 
$\Rightarrow$  So, we increase the digits at hundreds place by 1 and replace each one of the digits at tens and ones place by 0 to round off the given number to nearest to 100.

$\therefore$   The number becomes $4400$

Multiple choice maths mental arithmetic estimation and rounding off estimations, bounds and rounding off rounding off numbers rounding of decimals

Round-off $52,398$ to nearest $1000$.

  1. $52,390$
  2. $52,400$
  3. $52,000$
  4. $53,000$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\Rightarrow$  The given number is $52,398$

$\Rightarrow$  In number $52398$, its hundred digit is $3$, which is less than $5$. 
$\Rightarrow$  So, we replace each one of the digits at hundreds, tens and ones place by $0$ to round off the given number to nearest to $1000$.

$\therefore$   The number becomes $52,000$

Multiple choice maths mental arithmetic estimation and rounding off estimations, bounds and rounding off rounding off numbers rounding of decimals

Round-off $3789$ to nearest $100$

  1. $3789$
  2. $3790$
  3. $3800$
  4. $4000$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\Rightarrow$  The given number is $3789$

$\Rightarrow$  In number 3789, its tens digit is 8, which is greater than 5. 
$\Rightarrow$  So, we increase the digits at hundreds place by 1 and replace each one of the digits at tens and ones place by 0 to round off the given number to nearest to 100.

$\therefore$   The number becomes $3800$

Multiple choice maths mental arithmetic estimation and rounding off estimations, bounds and rounding off rounding off numbers rounding of decimals

Round-off $47,897$ to nearest $1000$.

  1. $47,897$
  2. $48,000$
  3. $47,900$
  4. $47,890$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$\Rightarrow$  The given number is $47,897$

$\Rightarrow$  In number 47897, its hundred digit is 8, which is greater than 5. 
$\Rightarrow$  So, we increase the digits at thousand place by 1 and replace each one of the digits at hundreds, tens and ones place by $0$ to round off the given number to nearest to 1000.

$\therefore$   The number becomes $48,000$

Multiple choice maths mental arithmetic estimation and rounding off estimations, bounds and rounding off rounding off numbers rounding of decimals

Fill in the blanks.
(i) The number 825642 rounded off to nearest thousand is   P  .
(ii) Estimated product of 4023 and 198 is   Q  .
(iii) CXXXI is written in Hindu-Arabic numeral as    R   .
P   Q   R

  1. 820000 800000 131

  2. 826000 800000 131

  3. 826000 850000 135

  4. 825000 800000 135
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

(i) 825642 rounded off to nearest thousand = 826000
(ii) 4023 estimated to 4000
 198 estimated to 200.
$\therefore$ estimated product = $4000\times 200$ = 800000
(iii) C denoted for 100
     X denotes for 10  
      I denotes for 1
$\therefore$ CXXXI denotes 131

Multiple choice maths mental arithmetic estimation and rounding off estimations, bounds and rounding off rounding off numbers rounding of decimals

State 'T' for true and 'F' for false.
I. Rounding off $2560$ to the nearest thousand, we get $2000$.
II. Place value of $9$ in $974304200 $ is ninety crore.
Ill. $1$ lakh $= 1000$ thousand
IV. Roman numeral for the smallest four-digit number is $M$.
I  II  III  IV

  1. T F T F

  2. F F T T

  3. T T T T

  4. F T F T
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

I.Rounding off $2560$ to the nearest thousand, we get $3000$. 

So, I is false
II. Place value of $9$ in $90,00,00,000$. 

So, II is true
III. $1$ lakh $= 1,00,000 = 100 $ thousand
IV. Smallest four digit number $= 1000$
Roman Numeral is $M$.
So, it is true

Multiple choice maths mental arithmetic estimation and rounding off estimations, bounds and rounding off rounding off numbers rounding of decimals

Mark the correct alternative of the following.
Total number of numbers which when rounded off to nearest ten give us $200$ is?

  1. $9$
  2. $10$
  3. $8$
  4. $7$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$195, 196, 197, 198, 199, 200, 201, 202, 203, 204$ are the numbers that when rounded off to nearest ten give us $200$.


Hence, total number of numbers which when rounded off to nearest ten give us $200$ is $10$.