Tag: concept of directed numbers and number line

Quizzes (5) Questions (73)

Questions Related to concept of directed numbers and number line

Multiple choice maths concept of directed numbers and number line subtraction of directed numbers subtraction of integers subtraction of integers on number line

The additive inverse of $\dfrac {2}{7}$ is 

  1. $\dfrac {2}{7}$
  2. $\dfrac {-2}{7}$
  3. $\dfrac {7}{2}$
  4. $\dfrac {-7}{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Additive inverse is negative of the given number.
  • Two rational numbers are additive inverse of each other when their sum is zero.

So additive inverse of $\dfrac{2}{7} $ is $ \dfrac{-2}{7}$.

Multiple choice maths concept of directed numbers and number line subtraction of directed numbers subtraction of integers subtraction of integers on number line

Instead of subtracting 32570 from a number . If 23570 is subtracted . Then what can we say about the answer ?

  1. Increased by 900

  2. Increased by 9000

  3. Decreased by 900

  4. Decreased by 9000
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let the  number be $x$

We know, $32570>23570$

$\therefore$  $(x-32570)<(x-23570)$
$\Rightarrow$  The difference between the numbers $=32570-23570$
                                                                      $=9000$

$\therefore$  We can say that, instead of subtracting $32570$ from number, if $23570$ is subtracted, then the answer can be increase by $9000$