Complete the following number patterns.
- 707, 646, 585, , 463
- 50, 56, 63, 71, .
- 67, , 82, 88, 92
(a)
707 - 646 = 61
646 - 585 = 61
585 - 61 = 524
Pattern: Keep subtracting 61 from left to right.
(b)
56 - 50 = 6
63 - 56 = 7 (1 is added to 6)
71 - 63 = 8 (1 is added to 7)
8 + 1 = 9
71 + 9 = 80
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
92 - 88 = 4
88 - 82 = 6
82 - 8 = 74
74 - 7 = 67
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 524; (b) 80; (c) 74
