CLASS 5 MATHS CH-4 FACTORS AND MULTIPLES

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 FACTORS AND MULTIPLES



 EXERCISE - 5

  A. Write down the prime numbers between the following-

 1.  2 and 25 = 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24

Prime numbers are 3, 5, 7, 11, 13, 17, 19, 23

3. 40 and 60 = 41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59 

Prime numbers are 41, 43, 47, 53, 59

5. 80 and 90 = 81,82,83,84,85,86,87,88,89

Prime numbers are 83, 89


b. Write all the composite numbers between the following.

1. 1 and 15 = 2,3,4,5,6,7,8,9,10,11,12,13,14

Composite numbers are 4, 6,8,9,10,12,14

3. 38 and 50 = 39,40,41,42,43,44,45,46,47,48,49

Composite numbers are 39,40,42,44,45,46,48,49

5. 70 and 85 = 71,72,73,74,75,76,77,78,79,80,81,82,83,84

Composite numbers are  72,74,75,76,77,78, 80,81,82,84


D. Find all the factors of the following other than 1.

1. 36 = 1x36

            2x18

            3x12

            4x9

            6x6

Factors of 36 are 2, 3, 4, 6, 9, 12, 18, 36

3. 64 = 1x64

            2x32

            4x16

            8x8

Factors of 64 are 2, 4, 8, 16, 32, 64

5. 124 = 1x124

               2x62

               4x31

Factors of 124 are 2, 4, 31, 62, 124

7. 169 = 1x169

               13x13

Factors of 169 are 13 and 169

9. 210 = 1x210

               2x105

               3x70

               5x42

               6x35

               7x30

               10x21

               14x15

Factors of 210 are 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210




              EXERCISE 6

A. Find the H.C.F of the following numbers by factorisation method.





Q B.


 

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