Number System One Mark Questions

7th Standard EM

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Maths

Time : 00:30:00 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. Identify the problem with negative numbers as its answer:

    (a)

    -9+(-5)+6

    (b)

    8+(-12)-6

    (c)

    -4+2+10

    (d)

    10+9-4)+8

  3. (-10)+(+7)=____

    (a)

    +3

    (b)

    -3

    (c)

    -17

    (d)

    +17

  4. (-100)-0+100=_____

    (a)

    200

    (b)

    0

    (c)

    100

    (d)

    -200

  5. Which of the following expressions is equal to –30.

    (a)

    –20 – (–5 x 2)

    (b)

    (6 x 10) – (6 x 5)

    (c)

    (2 x 5) + (4 x 5)

    (d)

    (–6) x (+5)

  6. 5 x 1 = 5
  7. _____\(\times \) (-9)=-45

    ()

    5

  8. ____\(\times \) 75=0

    ()

    0

  9.  (−40) ÷____=40

    ()

    -1

  10. (-5)+____=-100

    ()

    -95

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

    ()

    -104

  12. 5 x 1 = 5
  13. (-100)×0×20=0

    (a) True
    (b) False
  14. 8 × (−4) = 32

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

    (a) True
    (b) False
  16. (−64)÷(-64) IS 0

    (a) True
    (b) False
  17. The sum of a positive integer and a negative integer is always a positive integer.

    (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)

    Closed under addition

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

  26. (4)

    Distributive property of multiplication over addition

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

  28. (5)

    Additive identity

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