Question

list the common factors of each of the following sets of number. hence find their HCF.

1. 20 and 35
2. 18 and 27
3. 28 and 42
4. 24,32 and 48

please answer fast and in full solution​

Answer 1

Answer:

$20 = 2 \times 2 \times 5 \\ 35 = 5 \times 7 \\ hcf \: = 5$

$18 = 2 \times 3 \times 3 \\ 27 = 3 \times 3 \times 3 \\ hcf = 3$

$28 = 2 \times 2 \times 7 \\42 = 3 \times 2 \times 7 \\ hcf = 7$

$24 = 2 \times 2 \times 2 \times 3 \\ 32 = 2 \times 2 \times 2 \times 2 \times 2 \\ 48 = 2 \times 2 \times 2 \times 2 \times 3 \\ hcf = 2 \times 2 \times 2 = 8$