Question

as an
EXERCISE 1.2
1. Write down a pair of integers whose:
(a) sum is -7 (b) difference is -10
2. (a) Write a pair of negative integers whose difference gives 8.
(b) Write a negative integer and a positive integer whose sum is -5.
(c) Write a negative integer and a positive integer whose difference is -3.
3. In a quiz, team A scored - 40.10.0 and team B scored 10,0,- 40 in three successive
rounds. Which team scored more? Can we say that we can add integers in
(c)
sum is 0
any order?
4. Fill in the blanks to make the following statements true:
0) (-5)+(-8)=(-8) +( ..)
(m) -53 +......... = -53
(m) 17+...+1.7.=0
(iv) [13+ (-12)] + (.....) = 13+ [(-12)+(-7)
(v) (-4)+ [15+(-3)] = [- 4+15] + ..​

Answer 1

Answer:

Q-1) a) -5+(-2)= -7 ( b) -2-8=-10

Q-2) a) -2-(-10)-2+10=8 b) (-7) +2=-5

c) (-2)-1=-3

Q-3) Team A scored = -40,10,0

Total score of Team A= -40+10+0= -30

Team B scored = 10,0,-40

Total score of Team B=10+0+(-40)=10+0-40=-30

Thus,score of both teams are same.

Yes, we can add integers in any order due to commutative property.

Q-4) 1) - 5

2) 0

3) - 17

4) - 7

5)-3

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