Question

3. (-15) x 5 = 75
4. x + (-x) = 0
5. Sum of a-b+c and -a+b-c is zero.
10 x 2 = 20
IV. Answer the following questions:
1. Add
i) (-40) and (30)
ii) 60 and (-50)
2. Add
i) (-225) + (-63) ii) 20 + (-72)
3. Prove that (-7) x (+8) is an integer and mention the property.
4. Find the product of
i) (-35) x 22 =
ii) (-10) x 12 x (-9)
5. Divide i) (-85) by 5 ii) (-250) by (-25)
6. Find the area of the rhombus whose side is 17cm and the height is 8 cm.
7. Find the are of the trapezium whose height is 14cm and the parallel sider are 18cm and
9cm of length.
8. Find the numerical coefficient of each of the following terms.
-3yx, 12k, y, 121 bc, -x, 9pq, 2ab
ii)
-a from a
9. Subtract
i) 7 pq from 11 pq
10. Add:
i) 8x, 3x
ii) 7mn, 5mn
4 x 5 = 20
V. Answer the following questions:​

Answer 1

Answer:

3. (-15) x 5 = 75 ( Self explanatory)

4. x + (-x) = 0 ( Self explanatory addictive inverse property)

5. Sum of a-b+c and -a+b-c is zero. ( Self explanatory addictive inverse property for multiple numbers)

10 x 2 = 20 ( Self explanatory)

IV. Answer the following questions:

1. Add

i) (-40) and (30) = -10

ii) 60 and (-50) = -10

2. Add

i) (-225) + (-63) = -288

ii) 20 + (-72) = -52

3. Prove that (-7) x (+8) is an integer and mention the property.

= (-7) x (+8) = -56 which is an integer

4. Find the product of

i) (-35) x 22 = -770

ii) (-10) x 12 x (-9) = 1080

5. Divide i) (-85) by 5 = -17

ii) (-250) by (-25) = 10

6. Find the area of the rhombus whose side is 17cm and the height is 8 cm.

Area = Base* height = 17*8= 136 sq. cm

7. Find the are of the trapezium whose height is 14cm and the parallel sider are 18cm and

9cm of length.

$area \: o \: trapezium \: = \frac{1}{2} \times (sum \: of \: opposite \: sides) \times perpendicular \: distance \: between \: them$

Area of trapezium = 0.5 X (18+9) (14) = 189 square cm

8. Find the numerical coefficient of each of the following terms.

-3yx coefficient is -3

12k coefficient is 12k

y coefficient is 1

121 bc coefficient is 121bc

-x coefficient is -1

9pq coefficient is 9pq

2ab coefficient is 2ab

ii)

-a from a -a-a = -2a

9. Subtract

i) 7 pq from 11 pq = 7pq-11pq = -4pq

10. Add:

i) 8x, 3x =11x

ii) 7mn, 5mn =12mn

4 x 5 = 20 (Self explanatory)