Tag: maths

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Multiple choice maths decimal fraction multiplying decimals multiplication of decimals multiplication of division of decimal fraction by whole number and decimal fraction

Find the product
$\displaystyle 0.123\times 100$

  1. $1.23$
  2. $123$
  3. $12.3$
  4. $1230$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
To find $0.123\times 100$
Since, $100$ has $2$ zeros and $0.123$ has decimal point after $3$ digits
So, the product will have decimal point after $1$ digit from left

Therefore, value of $0.123\times 100$ is $12.3$.

Multiple choice maths decimal fraction multiplying decimals multiplication of decimals multiplication of division of decimal fraction by whole number and decimal fraction

Find the product
$\displaystyle 7.854\times 10$

  1. $785.4$
  2. $78.54$
  3. $7854$
  4. $78540$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
To find $7.854\times 10$
Since, $10$ has $1$ zero and $7.854$ has decimal point after $3$ digits
So, the product will have decimal point after $2$ digits from left

Therefore, value of $7.854\times 10$ is $78.54$.

Multiple choice maths calculating and mental strategies 3 written methods dividing decimals division of decimals

Express as rupees using decimals,

  1. $5\ paise$
  2. $75\ paise$
  3. $20\ paise$
  4. $50\ rupees\ 90\ paise$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
let $1paisa$ =$100 rs$
So,
$(i).$
$=>5paisa=\dfrac{5}{100}=0.005rs$

$(ii).$

$=>75paisa=\dfrac{75}{100}=\dfrac{3}{4}=0.75rs$

$(iii).$
$20paisa=\dfrac{20}{100}=0.2rs$

$(iv).$

$50rs$ $90paisa=50rs+90paisa$

$=>50+\dfrac{90}{100}$

$>=50+0.9=50.9rs$


























Multiple choice maths calculating and mental strategies 3 written methods dividing decimals division of decimals

If $\displaystyle\frac { 1 }{ 6.198 } = 0.16134$, then the value of $\displaystyle\frac { 1 }{ 0.0006198 } $ is.

  1. $16134$
  2. $1613.4$
  3. $0.16134$
  4. $0.016134$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$\displaystyle\frac { 1 }{ 0.0006198 } = \displaystyle\frac { 1 }{ \displaystyle\frac { 6.198 }{ 10000 }  } = \displaystyle\frac { 10000 }{ 6.198 } $

$= 10000 \times 0.16134 = 1613.4$

Multiple choice maths calculating and mental strategies 3 written methods dividing decimals division of decimals

Consider the following quotients:
I.   $368.39$ divided by $17$.
II.  $170.50$ divided by $62$.
III. $875.65$ divided by $83$.
Their correct sequence in decreasing order is ?

  1. I, III, II

  2. II, I, III

  3. II, III, I

  4. III, I, II
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(I) $\displaystyle\frac{368.39}{17} = 21.67$


(II) $\displaystyle\frac{170.50}{62} = 2.75$
(III) $\displaystyle\frac{875.65}{83} = 10.55$
$\therefore$ The correct sequence in decreasing order is (I), (III), (II).

Multiple choice maths calculating and mental strategies 3 written methods dividing decimals division of decimals

If $\displaystyle \frac{547.527}{0.0082}=x $, then the value of $\displaystyle \frac{547527}{82}$ is 

  1. $\displaystyle \frac{x}{10}$

  2. 10x

  3. 100x
  4. $\displaystyle \frac{x}{100}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Given, $\displaystyle \frac{547.527}{0.0082}=x $


$\displaystyle \Rightarrow \frac{5475270}{82}=x $

$\displaystyle \Rightarrow \frac{5475270}{82}=\frac{x}{10} $