Number System Book Back Questions

7th Standard EM

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Maths

Time : 00:45:00 Hrs
Total Marks : 30
    3 x 1 = 3
  1. (-10)+(+7)=____

    (a)

    +3

    (b)

    -3

    (c)

    -17

    (d)

    +17

  2. (-100)-0+100=_____

    (a)

    200

    (b)

    0

    (c)

    100

    (d)

    -200

  3. 11×(–1)=_____

    (a)

    -1

    (b)

    0

    (c)

    +1

    (d)

    –11

  4. 3 x 1 = 3
  5. ____\(\times \) 75=0

    ()

    0

  6. ____+(-22)=0

    ()

    22

  7. 75+(-25)=__

    ()

    50

  8. 4 x 1 = 4
  9. 8 × (−4) = 32

    (a) True
    (b) False
  10. (−30)÷(−6) =−6

    (a) True
    (b) False
  11. (−64)÷(-64) IS 0

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

    (a) True
    (b) False
  13. 3 x 2 = 6
  14. Find 5 pairs of integers that add up to 2.

  15. When Kala woke up, her body temperature was 102°F. She took medicine for fever. After 2 hours it was 2°F lower. What was her temperature then?

  16. A student was asked to subtract (–12) from (–47). He got−30.Is he correct? Justify.

  17. 3 x 3 = 9
  18. Add (i) (–40) and (30) (ii) 60 and (–50)

  19. Prove that (–7) × (+8) is an integer and mention the property.

  20. Are 3 × [(–4)+6] and [3 ×(–4)]+(3×6) equal? Mention the property.

  21. 1 x 5 = 5
  22. The temperature at Srinagar was −3°C on Friday. If the temperature decreases by 1°C next day, then what is the temperature on that day?

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