4. Crct ans) b) -4
For any two positive number, substracting the
larger from the smaller means, taking the negative
of the smaller substracted from the larger.
so 3-7= -(7-3)=-4
6. Crct ans) a)4
For any two positive number, adding the second
to the negative of the first means, substracting
the first from the second.
so -3+7=7-3=4
8. Crct ans) C) -12
For any two positive numbers, substracting the
second from the negative of the first means
finding the negative of their sum.
So -4-8=-(4+8)= -12
9. 4) Given z=x-y where x=10 and y= -3 then what
is the value of z ?
a)z= 7
b)z=13
c)z=-13
10. Crct ans ) b) z=13
Substracting the negative of a positive number
means adding that positive number.
so z=x-y implies z=10- -3=10+3=13
12. Crct ans ) b) x=4
The negative of the negative of a number is that
number itself.
So –(-4) =4
13. 6)Let x =8 and y =-3 then what is the value of x-y ?
a)x-y= 11
b)x-y= -11
c)x-y= 5
14. Crct ans) a) x-y= 11
For any two number, substracting one from
another is equal to the negative of
substracting in reverse.
i.e x-y= -(y-x) for all numbers x ,y
So x-y implies 8-(-3) = -(-3-8) = -(-11)=11
16. Crct ans ) b) -40
The product of a positive number and the negative
of a positive number means , the negative of the
product of these positive numbers.
Ie for any two positive numbers x,y
(-x)y= x(-y)=-(xy)
So 5.-8=-(5.8)= -40
17. 8)How many pairs of integers, satisfying the
equation 𝑥2
+ 𝑦2
= 25.
a) 4 pairs
b) 3 pairs
c) 5 pairs
18. Crct ans ) a) 4 pairs
The pairs are 32
+ 42
= 25, −32
+ 42
= 25,
−42
+ 32
= 25, −32
+ −42
= 25
So pairs are (3,4) (-3,4) (3,-4) (-3,-4)
Total no of pairs is 4.
22. Crct ans ) b) -3
Here (-6) divided by 2 means finding out the
number 2 should be multiplied to get -6.
2 is multiplied by -3 gives -6.
therefore the correct answer is -3.
