Tag: maths

Questions Related to maths

Multiplying a negative integer for odd times gives  a _____ result 

maths four operations whole number operations on the number line whole numbers on number line introduction to multiples and factors

  1. negative

  2. $0$

  3. positive

  4. none

Show answer
Correct Option: A
Explanation:

$(-1)\times(-1)\times(-1).......odd\;times\;=\;Negative\;sign$.

The difference between the greatest and least numbers of  $ \displaystyle \frac{5}{9}  $, $ \displaystyle \frac{1}{9}  $, $ \displaystyle \frac{11}{9}  $ is-

maths four operations whole number operations on the number line whole numbers on number line introduction to multiples and factors

  1. $ \displaystyle \frac{9}{2} $

  2. $ \displaystyle \frac{10}{9} $

  3. $ \displaystyle \frac{3}{8} $

  4. $ \displaystyle \frac{9}{10} $

Show answer
Correct Option: B
Explanation:

The ascending order of given numbers is  $ \displaystyle  \frac{1}{9} $,$ \displaystyle  \frac{5}{9} $,$ \displaystyle  \frac{11}{9} $


Here denominator is equal, so greater the numerator greater will be the value.

 $ \displaystyle \therefore  $ Required difference 
$ \displaystyle  \frac{11}{9} $-$ \displaystyle  \frac{1}{9} $=$ \displaystyle  \frac{10}{9} $ 

Let $x$ be a real variable, and let $3 < x < 4.$ Which of the following values, $x$ might have?

maths four operations whole number operations on the number line whole numbers on number line introduction to multiples and factors

  1. $-3.1$

  2. $\sqrt{11}$

  3. $\sqrt{\dfrac{10}{11}}$

  4. $4.1$

Show answer
Correct Option: B
Explanation:

$x$ can have any values between $3$ and $4$ so it can be rational or irrational. 
option $c$=$0.9$  and options $A$ and $D$ are outside the given range.
Hence, correct answer is option $B=\sqrt11=3.3$.

The rational number $\displaystyle \frac{-18}{5}$ lies between 

maths four operations whole number operations on the number line whole numbers on number line introduction to multiples and factors

  1. $- 2$ and $- 3$

  2. $- 3$ and $- 4$

  3. $- 4$ and $- 5$

  4. $- 5$ and $- 6$

Show answer
Correct Option: B
Explanation:

$\dfrac{-18}{5} = -3.6 $
Therefore, it lies between $-3$ and $-4.$

How many times does the digit $3$ appear while writing the integers from $1$ to $1000$?

maths four operations whole number operations on the number line whole numbers on number line introduction to multiples and factors

  1. $298$

  2. $299$

  3. $300$

  4. $301$

Show answer
Correct Option: C

The number of whole numbers between the smallest whole number and the greatest 2-digit number is:

maths four operations whole number operations on the number line whole numbers on number line introduction to multiples and factors

  1. $101$

  2. $100$

  3. $99$

  4. $98$

Show answer
Correct Option: D
Explanation:

The smallest whole number is $0$ and the two-digit greatest whole number is $99$.

So the numbers between $0$ and $99$ are $1,2,....,98$ i.e. there are $98$ whole numbers between $0$ and $99$.

If n is a whole number such that $n + n = n$, then $n =$ ?

maths four operations whole number operations on the number line whole numbers on number line introduction to multiples and factors

  1. 1

  2. 2

  3. 3

  4. None of these

Show answer
Correct Option: D
Explanation:

$n + n = n$

$2n = n$
Clearly $n = 0$, satisfies 
So $n = 0$ is the final answer.

How many whole numbers are between 437 and 487? 

maths four operations whole number operations on the number line whole numbers on number line introduction to multiples and factors

  1. $50$

  2. $49$

  3. $51$

  4. None of these

Show answer
Correct Option: B
Explanation:

No. of whole numbers in between

$=(487 - 437) - 1$
$= 50 - 1$
$= 49$

On a vertical number line positive numbers are placed ____ $0$

maths four operations whole number operations on the number line whole numbers on number line introduction to multiples and factors

  1. right side

  2. left side

  3. above

  4. below

Show answer
Correct Option: C
Explanation:

Positive number are located above $0$ and negative numbers are located below $0$ on a vertical number line 

The given below input rearranges step-by-step in particular order according to a set of rules. In this case the last step of arranged input is Step V.
Input :  85 16 36 04 19 97 63 09 
Step I :  97 85 16 36 04 19 63 09
Step II : 97 85 63 16 36 04 19 09
Step III : 97 85 63 36 16 04 19 09
Step IV : 97 85 63 36 19 16 04 09
Step V : 97 85 63 36 19 16 09 04
Study the above arrangement carefully and then answer the following question.
Which of the following will be step III for their input below?
Input : 09 25 16 30 32 18 17 06

maths four operations whole number operations on the number line whole numbers on number line introduction to multiples and factors

  1. 32 30 25 09 16 18 17 06

  2. 32 30 09 25 16 18 17 06

  3. 32 09 25 16 30 18 17 06

  4. 32 30 09 25 16 19 17 08

Show answer
Correct Option: A
Explanation:

In every step, the series progresses towards getting its elements arranged in a descending order.
So, in every step, the largest elements of the input come to the front.
Input : 09 25 16 30 32 18 17 06
Step I:32 09 25 16 30 18 17 06
Step II:32 30 09 25 16 18 17 06
Step III:32 30 25 09 16  18 17 06
Hence option A is answer.