Steps: 2 Marks
Answer: 1 Mark
$75p+50p=125p$
$\Rightarrow Re1+25p=Rs1.25$ 

Now, on subtracting Rs 1.25 from Rs 10, we get

$\Rightarrow Rs(10-1.25)=Rs\mathrm{8.75.}$
Thus, after her purchase, the money left with Priya is $Rs\mathrm{8.75.}$

Each option: 1 Mark
(a). 15, 13, 12, 0, -14
$\Rightarrow \left(\text{15 is the largest and -14 is the smallest among the given integers}\right)$
 

(b). 7, 5, 3, -3, -5  
$\Rightarrow \left(\text{7 is the largest and -5 is the smallest among the given integers}\right)$ 
 

(c). 9, 6, -7, -8, -10
$\Rightarrow \left(\text{9 is the largest and -10 is the smallest among the given integers}\right)$

Steps: 1 Mark
Answer: 1 Mark
Sum of 17 and -5
$\Rightarrow 17+(-5)=17-5=12$
Now, adding 3 and (-15) to 12 
$\Rightarrow 12+3+(-15)=15+(-15)$
$\Rightarrow 15-15=0$

Each option: 1 Mark
(a). $0$
(b). $-6+3=-3$
(c). The opposite of $-5$ is $+5$

Number line: 2 Marks
Answers: 2 Marks
(a). – 8 – (– 10) is equal to – 8 + 10 as additive inverse of –10 is 10. On the number line, from – 8 we will move 10 steps towards the right.

We reach at 2. Thus, –8 – (–10) = 2 Hence, to subtract an integer from another integer it is enough to add the additive inverse of the integer that is being subtracted, to the other integer.
(b) In the number line, it has to move two steps left from 6. We reach at 4. Therefore, $6−2=4$
 

Each option: 1 Mark
(a). Largest = $175$, Smallest = $-365$
 

(b). $\left[\right(-3)+(-2\left)\right]+\left[\right(-5)+7]$
$\Rightarrow [-3-2]+[-5+7]$
$\Rightarrow [-5+2]=-3$
 

(c). $-6÷-3=\frac{-6}{-3}=2$
  ($\Rightarrow -÷-=+$)
(d). $3\times 6\times 2\times (-40)$
 $\Rightarrow 18\times 2\times (-40)$
 $\Rightarrow 36\times (-40)=-1440$ 
 ($\Rightarrow as+\times -=-$)

Each point: 1 Mark
(i) $-87+55=-32$
$\Rightarrow 32m\text{below the water surface}$
(ii) $+98-115=-17$
$\Rightarrow 17m\text{below the water surface}$
(ii) $+36+57-73=20$
$\Rightarrow 20m\text{above the water surface}$
(iv) $-42-23+39=-26$
$\Rightarrow 26m\text{below the water surface}$

Each option: 1 Mark
(i) $+20$
$\Rightarrow \text{Walking 20 km towards north}$
(ii) $-30$
$\Rightarrow \text{Walking 30 km towards south}$
(iii) $-70$
$\Rightarrow \text{Walking 70 km towards south}$
(iv) $+45$
$\Rightarrow \text{Walking 45 km towards north}$