Question

GIRLS
SACR
106
2. (a) Cross out all prime numbers from the following list.
3. Find the prime factorisation of 120 by both factor tree method and continue Ex
(b) From the above list make 5 pairs of co-prime numbers.
1.
List the factors of 54.
S
EXERCISE 4.1
4, 7, 9, 11, 23, 25, 31, 36, 37, 42, 43, 51
Ifar
the
division method. Try to make 2 factor trees.
14. Find the H.C.Fof 20,28 by listing factors.
* 5. Find the H.C.F of 12 and 30 by prime factorisation-factor tree method.
6. Find the H.C.F of 27 and 45 by prime factorisation.
7. Find the H.C.F of 18, 42 and 48 by continuous division method.
8. Find the H.C.F of 217 and 686.
9. Find the H.C.F of 320 and 736.
10. Find the H.C.F of 450, 675, 825.
MULTIPLES​

Answer 1

Answer:

4- 140

8- 7

9- 16

Explanation:

4-  Factors of 20- 1, 2, 4, 5, 10 & 20

     Factors of 28- 1, 2, 4, 7, 14 & 28

     Common Factors of 20 & 28- 1, 2, 4

     Highest Common Factors (HCF)- 4

8- Factors of 217- 1, 7, 31 & 217

   Factors of 686- 1, 2, 7, 14, 49, 98, 343, 686

   Common Factors- 1, 7

   Highest Common Factors(HCF)- 7

9- Factors of 320- 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320

   Factors of 736- 1, 2, 4, 8, 16, 23, 32, 46, 92, 184, 368, 736

   Common Factors- 1, 2, 4, 8 & 16

   Highest Common Factors(HCF)- 16

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