(i) 2x = 2 × x
3x2 = 3 × x × x
4 = 2 × 2
The common factor is 1.
(ii) 6abc = 2 × 3 × a × b × c
24ab2 = 2 × 2 × 2 × 3 × a × b × b
12a2b = 2 × 2 × 3 × a × a × b
The common factors are 2, 3, a, b.
And, 2 × 3 × a × b = 6ab
(iii) 16x3 = 2 × 2 × 2 × 2 × x × x × x −4x2 = −1 × 2 × 2 × x × x
32x = 2 × 2 × 2 × 2 × 2 × x
The common factors are 2, 2, x.
And, 2 × 2 × x = 4x