Number System One Mark Questions

7th Standard EM

Reg.No. :
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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)

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)