Complete the following number patterns.
- 814, 736, 658, , 502
- 39, 46, 54, 63, .
- 155, , 169, 173, 175
(a)
814 - 736 = 78
736 - 658 = 78
658 - 78 = 580
Pattern: Keep subtracting 78 from left to right.
(b)
46 - 39 = 7
54 - 46 = 8 (1 is added to 7)
63 - 54 = 9 (1 is added to 8)
9 + 1 = 10
63 + 10 = 73
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
175 - 173 = 2
173 - 169 = 4
169 - 6 = 163
163 - 8 = 155
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 580; (b) 73; (c) 163
