Thursday, 29 March 2012

CBSE Class 6th ( VI) Mathematics Chapter 7. Fractions: Exercise 7.1 Solutions

Remember....

  1. A fraction means a part of a group or of a region.
  2. 5

      is a fraction. We read it as "five-twelfths".
    12
  3. Here "12" stand for the number of equal parts into which the whole has been divided.
  4. And "5" stand for the number of equal parts which have been taken out.
  5. Here 5 is called the numerator and 12 is called the denominator.
1. Write the fraction representing the shaded portion.
Answer:

    2
    =
    4

    1
    =
    9

    4
    =
    8

    1
    =
    4

    3
    =
    7

    3
    =
    12

    10
    =
    10

    4
    =
    9

    4
    =
    8

    1
    =
    2
    2. Colour the part according to the given fraction.




    Answer:



     
    3. Identify the error, if any.  
     
    Answer: 
      Which is not true as all the portions are not equal .
      Which is not true as all the portions are not equal .
      Which is not true as all the portions are not equal .
      
    4. What fraction of a day is 8 hours? Answer:We know numbers of hours in 1 day=24

    8
    1
    ∴ 8 hours=
    days=
    days

    24
    3
    5. What fraction of an hour is 40 minutes? Answer: We know numbers of minute in 1 hour =60 minutes

    40
    2
    40 minutes=
    hours =
    hours

    60
    3
6. Arya, Abhimanyu, and Vivek shared lunch. Arya has brought two sandwiches, one made of vegetable and one of jam. The other two boys forgot to bring their lunch. Arya agreed to share his sandwiches so that each person will have an equal share of each sandwich. 
    (a) How can Arya divide his sandwiches so that each person has an equal share? 
    (b) What part of a sandwich will each boy receive? 
     Answer: (a) Arya will divide each sandwich into three equal parts, and give one part of each sandwich to each one of them
     
     (b) When we divide each of 2 sandwiches into 3 equal parts. We have 6 pieces in total. Every one of them will get 2 pieces each out of 6 pieces.
    21
    ∴ Part of a sandwich will each boy receive
    =
    63
    7. Kanchan dyes dresses. She had to dye 30 dresses. She has so far finished 20 dresses. What fraction of dresses has she finished?  
    Answer: 
     The numbers of dresses, Kanchan had to dye = 30
     The numbers of dresses, She has so far finished =20
    202
    The fraction of dresses has she finished so far
    =
    303
    8. Write the natural numbers from 2 to 12. What fraction of them are prime numbers? Answer:
    The natural numbers from 2 to 12 : 2,3,4,5,6,7,8,9,10,11,12
    Out of these prime numbers are : 2, 3, 5, 7, 11
    Total numbers of natural numbers from 2 to 12 = 11
    Total numbers of prime numbers from 2 to 12 = 5
    5
    Fraction of numbers which are prime numbers from 2 to 12 =
    11
    9. Write the natural numbers from 102 to 113. What fraction of them are prime numbers? Answer:
    The natural numbers from 102 to 113 : 102,103,104,105,106,107,108,109,110,111,112, 113
    Out of these prime numbers are : 103, 107, 111, 113
    Total numbers of natural numbers from 2 to 12 = 12
    Total numbers of prime numbers from 2 to 12 = 4
    4
    Fraction of numbers which are prime numbers from 2 to 12=
    12
    10. What fraction of these circles have X’s in them? 

Answer:
4
=
8
11. Kristin received a CD player for her birthday. She bought 3 CDs and received 5 others as gifts. What fraction of her total CDs did she buy and what fraction did she receive as gifts?

Answer:
The numbers of CDs she bought= 3
The numbers of CDs she received as gift = 5
Total numbers of CDs she have = 8
3
Fraction of CDs she bought =
8
5
Fraction of CDs she bought =
8

1 comment:

  1. question no.8 answer is wrong because 109 is a prime number so pls rectify the answer of it. Thank you

    ReplyDelete