[Exercise- page 34]
E.2.1. What is the positive opposite of –a?
(a) + a
(b) -a
(c) 1a
(d) -1a
Solution:
E.2.2. If we add the positive opposite of 12 with 12 itself then the sum becomes-
(a) -24
(b) -12
(c) 0
(d) 24
Solution:
E.2.3. if 
- 15 = -10 then what is the number in ?
(a) -25
(b) -5
(c) 25
(d) 5
Solution:
[Answer the questions 4 and 5 considering the information given below: -7, -8 and -9 are three integers.]
E.2.4. If you add the positive opposite of second integer with the first integer then the sum is,
(a) -15
(b) -1
(c) 1
(d) 15
Solution:
E.2.5. If the second integer is added with the sum of 1st and 3rd integers’ positive opposites then the result becomes A,
(a) A ＜ -15
(b) A ＞ -90
(c) A ＞ 97
(d) A ＜ -97
Solution:
E.2.6. if A = 45 - (-11) and B = 57 + (-4) then,
(i) A = 56
(ii) B = -53
(iii) A - B = 3
Which of the following is correct?
(a) (i) & (ii)
(b) (i) & (iii)
(c) (ii) & (iii)
(d) (i), (ii) & (iii)
Solution:
E.2.7. The marked portion in the picture has
(i) Non-negative integer
(ii) All prime numbers
(iii) All even numbers
Which of the following is correct?
(a) i & ii
(b) i & iii
(c) ii & iii
(d) i, ii & iii
Solution:
E.2.8. Arrange the numbers 5, 7, 8, 3, 1, 2, 1, 0, 9, 3 in ascending order with the help of number lines.
Solution:
E.2.9. Write the integers between the given numbers in ascending order:
(a) 0 and -7
(b) -4 and 4
(c) 0 and 7
(d) 30 and -23
Solution:
E.2.10. (a) Write four negative integers greater than -20.
(b) Write four negative integers smaller than -10.
(c) Write four negative integers between -10 and -5.
Solution:
E.2.11. (a) Determine the value of -8-(10).
(b) Subtract -4 from -10.
(c) Subtract +3 from -3.
Solution:
E.2.12. Determine the subtraction.
(a) 35 - 20
(b) 72 - 90
(c) (-20) - 13
(d) (-15) - (-18)
(e) (-32) - (-40)
(f) 23 - (-12)
Solution:
E.2.13. Use > or < or ＝ in the blanks below.
(a) (-3)(-3) + (-6) (-3) - (-6)
(b) (-21) - (-10) (-31) + (-11)
(c) 45 - (-11) 57 + (-4)
(d) (-25) - (-42) (-42) - (-25)
Solution:
E.2.14. Fill up the blanks below.
(a) (-8) + = 0
(b) 13 + = 10
(c) 12 + (-12) =
(d) (-4) + = -12
(e) - 15 = -10
Solution:
E.2.15. Determine the value.
(a) (-7) - 8 - (-25)
(b) (-13) + 32 -8 -1
(c) (-7) + (-8) + (-90)
(d) 50 - (-40) - (-2)
Solution:
E.2.16. A = (-9) + 4 + (-6), B = 7 + (-4)
(a) Determine the value of B.
(b) Prove that A ＜ B.
(c) Determine (A+B) after placing the value of A and B on number line.
Solution:
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