CBSE Class 8 Mental Maths Rational Numbers Worksheet
CBSE Class 8 Mental Maths Rational Numbers Worksheet with Solution by Expert Mathematician. Students of 8th Grade can solve this worksheet for extra preparation before exam.Private Teacher or Guardians of the Students can copy all the questions of this chapter and will match after solve their students.
Rational Numbers Class 8 Worksheet
1.) Find the value of -5/12 + 7/18
2.) Find the value of -15/17 + 12/51
3.) Find the value of -2/7 ÷ 2/9 × 3/7
4.) Find the value of 2+(3/4-1/5)÷3
5.) Find the value of 12/17 ÷ 18/34 ÷ 1/6
6.) What should be added to (1/3+1/2) to get 3?
7.) The sum of two rational number is -43/52. If one of the number is 5/12 then what is the other number?
8.) What should be subtracted from 5 to get 13/3?
9.) If x:2/3 = 2:3 then what is the value of x?
10.) Rahim has 2000 rs. If he spends ¼ of his money on groceries and 2/5th of his money on traveling. How much money is left?
11.) If 3/5th of a number is 6, then what is that number?
12.) If 4 shirts can be made from 35 meter of cloth. How much cloth is needed for each shirt?
13.) If 3/7th of a bucket is 3liters. Then what is the capacity of the bucket?
14.) If 3/5 ÷ x = 4/7 ,then Find the value of x?
15.) Find the value of 3/4 + 5/6 ÷ 3/5
16.) The product of two fractions is 39/77 and one of the numbers is 13/7. Then find the other number.
17.) A bus covers 57 km in one hour. What distance it will cover in 5/3 hours?
18.) If 1/10th of x is 100, then what is the value of x?
19.) The total capacity of a cinema hall is 300. If 3/5th of the hall is full. Then how many seats are empty?
20.) Find the value of (-6/-7) ÷ 3/7
21.) After completing 2/3rd of a book 30 pages are remaining. How many pages are there?
22.) Find the value of 3/5 ÷ (-7/9)
23.) 3/7 th of number of seats of a bus is 42. What’s the total capacity of the bus?
24.) Find the value of -6/7 + 9/8 – 3/5 ÷ 4/7
25.) What is the difference between 11/99and 1111/9999?
Answers:
1.) -5/12 + 7/18
=-15+14/36
=1/36
2.) -15/17 + 12/51
=-45+12/51
=-33/51
= -11/17
3.) -2/7÷2/9×3/7
=-2/7 × 9/2 × 3/7
-27/49
4.) 2+(3/4 – 1/5)÷3
=(2+ 15-4/20)÷3
=(2+11/20)÷3
=(40+11/20)× 1/3
=51/20 × 1/3
=17/20
5.) 12/17÷18/34÷1/6
=12/17×34/18×6
=8
6.) 3-(1/3+1/2)
=3-(2+3/6)
=3-5/6
=18-5/6
=13/6
7.) -43/52 – 5/12
=-12/13
8.) 5- 13/3
=(15-13)/3
=2/3
9.) X:2/3=2:3
=3x/2 =2/3
=9x=4
X=4/9
10.) Ram spends on groceries= 2000×1/4 = 500rs
Ram spends on traveling= 2000×2/5=800rs
So,money left: 2000-(500+800)
=700rs
11.) Let the number is x
So, 3/5th of x =6
3x/5=6
3x=30
X=10
12.) 35/4 meters
=8¾ m
13.) Let the full bucket is of X liters
So , 3/7th of x =3
3x=21
X=7
14.) 3/5÷x=4/7
3/5 × 1/x = 4/7
3/5x = 4/7
20x=21
X= 21/20
15.) 3/4 +5/6 ÷ 3/5
=3/4 + 5/6 ×5/3
=3/4 + 25/18
= (27+30)/36
=57/36
=19/12
16.) Let one fraction is p
So, p× 13/7 = 39/77
P= 39/77 × 7/13
P= 1/3
17.) 57× 5/3
=95kms
18.) X × 1/10 = 100
X=1000
19.) Filled seats= 300×3/5
= 180
So empty seats (300-180)=120
20.) -6/-7÷3/7
=6/7 × 7/3
=42/21
=2
21.) Pages left 1- 2/3 =1/3
Let total pages= p
Then p×1/3 = 30
So p= 90
22.) 3/5 ÷ (-7/9)
3/5 × (-9/7)
-27/25
23.) Let total seats P
Then p × 3/7 = 42
So p= 84
24.) -6/7 + 9/8 -3/5 × 7/5
= -6/7 + 9/8 – 21/20
= (-240-315-294)/280
= -849/280
25.) 11/99 – 1111/9999
= 1/9 – 1/9
= 0