Extend the patterns of multiples and solve the multiplication problem: 28 x 62.

let's extend these patterns and solve the multiplication.

2. These are multiples of (extend the pattern):

*a) 20:
The pattern increases by 20 each time.

$$60, 80, 100, 120, \boxed{140}, \boxed{160}, \boxed{180}, \boxed{200}, \boxed{220}$$

*b) 50:
The pattern increases by 50 each time.

$$150, 200, 250, 300, \boxed{350}, \boxed{400}, \boxed{450}, \boxed{500}, \boxed{550}$$

*c) 100:
The pattern increases by 100 each time.

$$500, 600, 700, 800, \boxed{900}, \boxed{1000}, \boxed{1100}, \boxed{1200}, \boxed{1300}$$

*d) 200:
The pattern increases by 200 each time.

$$200, 400, 600, 800, \boxed{1000}, \boxed{1200}, \boxed{1400}, \boxed{1600}, \boxed{1800}$$

*e) 250:
The pattern increases by 250 each time.

$$0, 250, 500, 750, \boxed{1000}, \boxed{1250}, \boxed{1500}, \boxed{1750}, \boxed{2000}$$

Multiplication:

*b) $28 \times 62 =$