T1 - Number System Important Questions

7th Standard

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Maths

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. The temperature at 12 noon at a certain place was 18° above zero. If it decreases at the rate of 3° per hour at what time it would be 12° below zero?

    (a)

    12 mid night

    (b)

    12 noon

    (c)

    10 am

    (d)

    10 pm

  2. (-10) + ( +7)=____

    (a)

    +3

    (b)

    -3

    (c)

    -17

    (d)

    +17

  3. 20 + (-9) + (9)

    (a)

    20

    (b)

    29

    (c)

    11

    (d)

    38

  4. Which property is illustrated by the equation:(5 x 2) + (5 x 5) = 5 x (2 + 5)

    (a)

    commutative

    (b)

    closure

    (c)

    distributive

    (d)

    associative

  5. Which of the following does not represent an Integer?

    (a)

    0 ÷ (-7)

    (b)

    20 ÷ (−4)

    (c)

    (-9) ÷ 3

    (d)

    (12) ÷ 5

  6. 5 x 1 = 5
  7.  -(30) + ____ = 60

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    90

  8. Fill in the blanks
    (i) - 80\(\times \)__ = -80

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    1

  9. _____\(\times \) (-9) = -45

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    5

  10.  (−40) ÷____ = 40

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    -1

  11. 75 + (-25) = __

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    50

  12. 5 x 1 = 5
  13. (-45) - (-8) = (-8) - (-45)

    (a) True
    (b) False
  14. (-100) x 0 x 20 = 0

    (a) True
    (b) False
  15. (−30) ÷ (−6) = −6

    (a) True
    (b) False
  16. The product of two negative integers is a positive integer

    (a) True
    (b) False
  17. (−90) + ( −30) = 60

    (a) True
    (b) False
  18. 5 x 1 = 5
  19. For any two integers 72 and 108, 72 +108 is an also an integer

  20. (1)

    Commutative property under multiplication.

  21. For any three integers 68, 25 and 99
    68 x( 25 + 99) = ( 68 x 25 ) + ( 68 x 9)

  22. (2)

    Closed under addition

  23. 0 + (−138) = (−138) = (−138)+0

  24. (3)

    Additive identity

  25. For any two integers (−5) and 10
    (−5) x 10 = 10 x (−5)

  26. (4)

    Distributive property of multiplication over addition

  27. 1 x (-1098) = (–1098) = (–1098) x 1

  28. (5)

    Multiplicative identity

    7 x 2 = 14
  29. Add the following
    (i) 8 and –12 using number line
    (ii) (–3) and (–5) using number line
    (iii) (-100 + (-10)  
    (iv) 20 + (-72)
    (v) 82 + (-75) 
    (vi) -48 + (-15)
    (vii) -225 + (-63)

  30. Kabilan was having 10 pencils with him. He gave 2 pencils to Senthil and 3 to Karthik. Next day his father gave him 6 more pencils, from that he gave 8 to his sister. How many pencils are left with him?

  31. What number should be added to (–17) to get (–19)?

  32. During summer, the level of the water in a pond decreases by 2 inches every week due to evaporation. What is the change in the level of the water over a period of 6 weeks?

  33. If P = -15 and Q = 5 find (P-Q) + (P+Q)

  34. Subtract 94860 from (-86945)

  35. Divide (72) by 8

  36. 2 x 3 = 6
  37. Add the following integers using number line
    (i) 10 and –15
    (ii) –7 and –9

  38. Find the missing integers 
    (i) 0 + (2345) =______
    (ii) 23479 +  ______= 0

  39. 2 x 5 = 10
  40. (i) Subtract (−40) from 70 
    (ii) Subtract (-12) from (-20)

  41. A shopkeeper earns a profit of Rs. 5 by selling one notebook and incurs a loss of Rs. 2 per pen while selling of his old stock. In a particular day he earns neither profit nor loss. If he sold 20 notebooks, how many pens did he sell?

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