Complete the following number patterns.
- 766, 686, 606, , 446
- 49, 59, 70, 82, .
- 91, , 109, 114, 117
(a)
766 - 686 = 80
686 - 606 = 80
606 - 80 = 526
Pattern: Keep subtracting 80 from left to right.
(b)
59 - 49 = 10
70 - 59 = 11 (1 is added to 10)
82 - 70 = 12 (1 is added to 11)
12 + 1 = 13
82 + 13 = 95
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
117 - 114 = 3
114 - 109 = 5
109 - 7 = 102
102 - 11 = 91
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 526; (b) 95; (c) 102
