Complete the following number patterns.
- 543, 483, 423, , 303
- 30, 38, 47, 57, .
- 81, , 97, 102, 105
(a)
543 - 483 = 60
483 - 423 = 60
423 - 60 = 363
Pattern: Keep subtracting 60 from left to right.
(b)
38 - 30 = 8
47 - 38 = 9 (1 is added to 8)
57 - 47 = 10 (1 is added to 9)
10 + 1 = 11
57 + 11 = 68
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
105 - 102 = 3
102 - 97 = 5
97 - 7 = 90
90 - 9 = 81
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 363; (b) 68; (c) 90
