Number System Model Question Paper

7th Standard EM

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Maths

Time : 01:30:00 Hrs
Total Marks : 50
    4 x 1 = 4
  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. 20+(-9)+(9)

    (a)

    20

    (b)

    29

    (c)

    11

    (d)

    38

  3. 11×(–1)=_____

    (a)

    -1

    (b)

    0

    (c)

    +1

    (d)

    –11

  4. The set of integers is not closed under

    (a)

    Addition

    (b)

    Subtraction

    (c)

    Multiplication

    (d)

    Division

  5. 4 x 1 = 4
  6. (-10)\(\times \) __=20

    ()

    -2

  7. _____\(\times \) (-9)=-45

    ()

    5

  8. (-5)+____=-100

    ()

    -95

  9. 171+____=0

    ()

    -171

  10. 5 x 1 = 5
  11. The additive inverse of (–32) is (–32)

    (a) True
    (b) False
  12. 15-(-18) is the same as 15+18

    (a) True
    (b) False
  13. 8 × (−4) = 32

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

    (a) True
    (b) False
  15. (−125)+25 = −100

    (a) True
    (b) False
  16. 6 x 2 = 12
  17. 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)

  18. 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?

  19. 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?

  20. Check the following for equality and if they are equal, mention the property.
    (i) (8-13)×7and 9-(13×7)
    (ii) [(-6)-(+8)]×(−4) and (-6)-[8(−4)]
    (iii)3×[(-4)+(-10)]and[3×(-4)+3×(-10)]

  21. Given 168×32=5376 then, find(−5376)÷(-32). 

  22. (-400) divided into 10 equal parts gives _____.

  23. 5 x 3 = 15
  24. Add: (i) (–70) and (–12) (ii) 103 and 39.

  25. From the ground floor a man went up six floors and came down six floors. In which floor is he now?

  26. Find the value of :
    (i) (-35)\(\times \) (-11)  (ii) 96\(\times \)(-20)  (iii) (-5)\(\times \)12  (iv) 15\(\times \) 5  (v) 999\(\times \)0

  27. Are (–42) × (–7) and (–7) × (–42) equal? Mention the property.

  28. Each day, the workers drill down 22 feet further until they hit a pool of water. If the water is at 110 feet, on which day will they hit the pool of water?

  29. 2 x 5 = 10
  30. Subtract the following using the number line.
    (i) –3 – (–2)  (ii) +6 – (–5)

  31. 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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