1 Marks Question

Question 11 Mark

Write the opposite of the following:
$20m$ below the danger mark of the river Brahmaputra.

Answer

$20m$ above the danger mark of the river Brahmaputra.

Question 21 Mark

Write the integer which is its own additive inverse.

Answer

Zero $(0)$ is its own additive inverse, i.e. $0 \times (-1) = 0.$

Question 31 Mark

Compute the following: $30 + (-25) + (-10)$

Answer

$30 + [(-25) + (-10)] = 30 - 25 - 10 = 30 - (25 + 10) = 30 - 35 = -5$

Question 41 Mark

Write the opposite of the following: Winning by a margin of $2000$ votes.

Answer

Losing by a margin of $2000$ votes.

Question 51 Mark

The additive inverse of $-1$ is _______ .

Answer

The additive inverse of $-1$ is $1.$

Question 61 Mark

On the number line, $-15$ is to the _______ of zero.

Answer

Clearly, on the number line, $-15$ is to the left of zero.

Question 71 Mark

Find the value of: $49 - (-40) - (-3) + 69$

Answer

We have, $49 - (-40) - (-3) + 69 = 49 + 40 + 3 + 69 = 161$

Question 81 Mark

On the number line, $10$ is to the _______ of zero.

Answer

Clearly, on the number line, $-15$ is to the right of zero.

Question 91 Mark

Write two distinct integers whose sum is equal to one of the integers.

Answer

On adding $0 ($zero$)$ to any other integer, we get the sum equal to that integer.
Let $3$ and $0$ be two distinct integers, then $3 + 0 = 3.$

MATHS 1 Marks Question