#### Number System One Mark Questions

7th Standard EM

Reg.No. :
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Maths

Time : 01:00:00 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. (-5)-(-18)=____

(a)

23

(b)

-13

(c)

13

(d)

-23

3. Which of the following does not represent an Integer?

(a)

0÷(-7)

(b)

20÷(−4)

(c)

(-9)÷3

(d)

(12)÷5

4. (−200)÷10is

(a)

20

(b)

-20

(c)

-190

(d)

210

5. The set of integers is not closed under

(a)

(b)

Subtraction

(c)

Multiplication

(d)

Division

6. 5 x 1 = 5
7.  -(30)+____=60

()

90

8. -44+____ =-88

()

(-44)

9. (100) $\times$ ______=-500

()

-5

10.  (−40) ÷____=40

()

-1

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

()

-104

12. 5 x 1 = 5
13. The additive inverse of (–32) is (–32)

(a) True
(b) False
14. (-675)-(-400)=-1075

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

(a) True
(b) False
16. (-45)-(-8)=(-8)-(-45)

(a) True
(b) False
17. (-15)×5=75

(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)