Number System One Mark Questions

7th Standard EM

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Maths

Time : 01:00:00 Hrs
Total Marks : 20
    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. (-5)-(-18)=____

    (a)

    23

    (b)

    -13

    (c)

    13

    (d)

    -23

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

    (a)

    0÷(-7)

    (b)

    20÷(−4)

    (c)

    (-9)÷3

    (d)

    (12)÷5

  4. (−200)÷10is

    (a)

    20

    (b)

    -20

    (c)

    -190

    (d)

    210

  5. The set of integers is not closed under

    (a)

    Addition

    (b)

    Subtraction

    (c)

    Multiplication

    (d)

    Division

  6. 5 x 1 = 5
  7.  -(30)+____=60

    ()

    90

  8. -44+____ =-88

    ()

    (-44)

  9. (100) \(\times \) ______=-500

    ()

    -5

  10.  (−40) ÷____=40

    ()

    -1

  11. (-52)+(-52)=____

    ()

    -104

  12. 5 x 1 = 5
  13. The additive inverse of (–32) is (–32)

    (a) True
    (b) False
  14. (-675)-(-400)=-1075

    (a) True
    (b) False
  15. 15-(-18) is the same as 15+18

    (a) True
    (b) False
  16. (-45)-(-8)=(-8)-(-45)

    (a) True
    (b) False
  17. (-15)×5=75

    (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)

    Multiplicative identity

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

  22. (2)

    Commutative property under multiplication.

  23. 0 + (−138) = (−138) = (−138)+0

  24. (3)

    Additive identity

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

  26. (4)

    Closed under addition

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

  28. (5)

    Distributive property of multiplication over addition

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