**(1)** **Write all the factors of the following numbers**

**a. 24**

Sol:

24 = 1 × 24,

24 = 2 × 12,

24 = 3 × 8,

24 = 4 × 6,

24 = 6 × 4,

24 = 8 × 3,

24 = 12 × 2,

24 = 24 ×1**So, the factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24.**

**b. 15**

Sol:

15 = 1 × 15,

15 = 3 × 5,

15 = 5 × 3,

15 = 15 × 1**So, the factors of 15 are 1, 3, 5 and 15.**

**c. 21**

Sol:

21 = 1 × 21,

21 = 3 × 7,

21 = 7 × 3,

21 = 21 × 1**So, the factors are 1, 3, 7 and 21.**

**d. 27**

Sol:**27 = 1 × 27**, **27 = 3 × 9**, **27 = 9 × 3**, **27 = 27 × 1****So, the factors are 1, 3, 9 and 27.**

**e. 12**

Sol:

12 = 1 × 12,

12 = 2 × 6,

12 = 3 × 4,

12 = 4 × 3,

12 = 6 × 2,

12 = 12 × 1**So, the factors are 1, 2, 3, 4, 6 and 12.**

**f. 20**

Sol:

20 = 1 × 20,

20 = 2 × 10,

20 = 4 × 5,

20 = 5 × 4,

20 = 10 × 2,

20 = 20 × 1**So, the factors are 1, 2, 4, 5, 10 and 20**.

**g. 18**

Sol:

18 = 1 × 18,

18 = 2 × 9,

18 = 3 × 6,

18 = 6 × 3,

18 = 9 × 2,

18 = 18 × 1** So, the factors are 1, 2, 3, 6, 9 and 18.**

**h. 23**

Sol:

23 = 1 × 23,

23 = 23 × 1**So, factors of 23 are 1 and 23.**

**i. 36**

Sol:

36 = 1 × 36,

36 = 2 × 18,

36 = 3 × 12,

36 = 4 × 9,

36 = 6 × 6,

36 = 9 × 4,

36 = 12 × 3,

36 = 18 × 2,

36 = 36 × 1**So, factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18 and 36**.