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#### Number System Model Question Paper

7th Standard EM

Reg.No. :
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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)

(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
(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?