revision ws 8

8/12/2019 Revision WS 8

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Revision worksheet- Math

Choose the correct answer:

1. Which of the following is an inverse variation?(a) Quantity bought and price (b)time of travel and distance(b) number of workers and work done(d) number of workers andtime taken

2. If 10 workerc can finish a.job in 10 days, in how many days will 50. workers finish'it?

(a) s (b) 15 (c) 100 (d) 2. 3. The difference between the highest and lowest values of a set of d

is called

(a)mean (b) mode (c) median (d) range

4. What is the range of: 1,2,2,3,3,3,4,4,4,4?(a) 3 (b) 4 (c) 1(d)2

5. Which of the following is the equation of a line parallel to x-axis?(a) x=0 (b) x=5 (c) Y=5 (d) Y=x+s

6. The point (-20,-30) lies(a) 30 units above the x-axis (b)30 units below the x-axis(c) 30 units to the left of x-axis (d) 30 units to the ri ht of x-axis

7. The volume of a cube of side 0.01m in cubic centlrnbtbrs

(a) 0.000001 (b) o.oo01 (c) 0.001 (d) 1

8. A pipe that fills 25o/o of a tank in t hour will fillit in(a) 25 hours (b) 4 hours (c) 2 hours (d) V4 hours


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Solve the following:

1. Simplify: (16 m2-9n') (rO m2+9n212. 103x 97 (use appropriate identity)

g. (x2-z) (x3+3)4. Factorize: 6x2+3x+2x+15. x+2- x-3 =5-x-1

3426. 2(x-1) + 3 (x-2) = 4 (x-3)7. The base and height of a parallelogram is in the ratio 5:6. Its area is

L470 sq.units.' Find the base and height of the parallelogram.8. The area of a trapezium is 110cm2and its height is 10cm. if one of the

parallei sides is longer than the other by 8cm, find the two parallelsides.

9. Find the height of a cuboidal water tank in meterstank is 32000 dm3 and area of the base is 1600dm2.

10. A sum at simple interest of 13 Vz o/o. per annum amounts toRs.2502.50 after 4 years. Find the sum.

Solve:

1. A dice is thrown once. What is the probability of letting: (a)a primenumber (b) a number between 2 &6 (c) an odd number (d) an evennumber

2. The area required to keep 20 insects in a laboratory is 4786 x 10 -8km2. How much area is required to keep 900 insects?(Area in km2)

3. The value of a residential flat constructed at the cost of

Rs.lO, 00,000 is depreciating at the rate of L|o/o per annum. What willbe the value after 3 years after its construction?

4. What price should a shopkeeper mark on an article, costing himRs.150 to gain 2Oo/o after allowing a discountof L0 o/o?

5. Three cubes of side 5cm each are joined together as shown in the fig.below.(a) find the surface area of the cuboid formed (b) find thevolume of the cuboid formed.

if volume of lhe

:i


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11. The sum of the digitsobtained bY interchanging27. Find the number.

Solve the following:

in a bag valued as Rs.555. if the coins are of 2denomination, find the number of coins of each

ffimber is 7. The numberthe digits exceeds the original number by

6. Find the perimeter and area of a rhombus whose diagonals are 6cm

and 8cm.7. The difference between the simple interest and compound interest on

a certain sum at L}o/o per annum is Rs 283.50 for 3 years. Find thesum.

g. . Two horses are sold at Rs.9000 each. On one he gains 10o/o andanother he loses LOo/o. How much is his gain or loss percentage in the

whole transaction?9. There are 165 coins

rupee and 5 ruPeetype in her bag.

10. Find the values of m, ninversely.

,p, Q in the following tables if x and y vary

x 1 2 3 4 5 q

v 1200 600 m 300 n200

lrt r'

1. Draw a line graph for the following data. It shows th'e temperature of

Neha noted after every hour when she was suffering frorn fever''

Time 1lam 12noon 1pm 2pm 3pm 4pm 5pm

Temperature(in' F)

101 100.5 L02 101.5 101 99 100

pftFfZpl anO B(0,2)on a gra@nd B. Write the co-ordinates of points where the line segment AB intersects x-axis andy-axis.A car is running on a highway at a constant speed of 90 km/hr'Find: (a) the distance travelled by car in t hr 30 minutes (b) timetaken by the car to cover a distance of 540km'

Construct a rhombus with side 5.5cm and one of its angles 70 '

2.

3.

4.

5cm


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Grade 8(CBSE)

Mathematics Revision Question Bank

I. MuItiPIe choice questions:

l.The HCF of 8x3f *d 12 x2Y is

a.4xy b.8x2yc.4x2y

,z,Thesumof2digitnumbersis25andtheirdifferenceisl.

d.4*f

d. 14 and 11

a.0.000001

6. If l0 workers can complete a job in 10 days, in how many days will 50 workers complete thesame?

a.5 b. 15 c. 100 d.2

7._A pipe that fil1s 25Yo of thetank in t hour, will fill the tank completely in

c. 2 hours d. quarter ofan hour

a. l0 and 15 b. 16 and 9 c. 12 and 13

3.'The area of a parallelogram is 56 crn2,the height is 4 cm, the basewill be

a lcm b. l4cm c.9cm d. 16cm

4. The difference between the highest and lowest values of a set of data iscalled

b. median c. ranged. mode

a. mean

5. The volume of a cube of side 0.01m in cubic centimetes

b.0.0001 c.0.001 d. 1

a.25 hours b. 4 hoursII. Do as directed

l.Find the value of: : i) (53)2 ii) (1011)2 iii) (92)'? iv) (975)2 - Q5)'2.Subtract : * -b2 from z*-zf+z3. Find the fotlowing Products:

i) (ap + 3)(aP + 7)ii) (3x + 4Y)(4x + 3Y)iii) (m +7)(m-7)iv) (a + 3)q - 11* + e1

v) (167)2 - (133)2


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4. Expand: i) (3x+7v)2 iD (++..6rl iiil [:'z -*)'

5. Find th.e product using identities i

a. Qa+ Sb)Qa + 5b)

b(;.*)(;.t)c. 46x54

' d. 88xl12

u.,,( .i) : 4.,rndthe vatues *,

('.1)'' ('-f

7. Fas:rrlilzn;

u 27a3i -qs{*b. (3x +2yf -(x4vfc. l6aa-81b'a.f-5y-24e.h?+l2x-36f. 14m2 - 23m + 8e. 3lY+ 1lrry + 6Y

S.Frameanequationandthensolve:4morethantwiceanumberis289. Find the value of 'P'.

ztox 27 x ), =ou'

10. The sum of three consecutive odd numbers is 75. Find thenumbers'

11. The denominator of a fraction is r more than doubre the numerator.on adding 2 to the numerator and

subtracting 3 from the denominator, we obtain l. Find the original fraction'

12. Find the area of the triangle with base 2'cmand altitude 40cm'

13. Find the radius and area of a circle whose circumference is 264cm'

14. The area of aright tiangle is 240cm2 and one of its sides is l6cm long.Find the length ofthe other side'

15. Find the area of a rhombus whose perimeter is 48cm and altitudeis 8'5cm'

16. The perimeter of atapezium is 52cm.If its non-parallel sides are l0cm each andits altitude is 8cm' find

the area of the traPezium'

17. The volume of a circular cylinder is 1,r00cm3 and the radius of itsbase is 5 cm. Find the curved surface

area.

lg. After allowing 20zo discount to the oustomer, a dealer still gains 20%.Findthe marked price of the

electric fan which costs him Rs'1,600

,

\


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revision ws 8

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