Complete the following number patterns.
- 810, 735, 660, , 510
- 48, 55, 63, 72, .
- 168, , 182, 186, 188
(a)
810 - 735 = 75
735 - 660 = 75
660 - 75 = 585
Pattern: Keep subtracting 75 from left to right.
(b)
55 - 48 = 7
63 - 55 = 8 (1 is added to 7)
72 - 63 = 9 (1 is added to 8)
9 + 1 = 10
72 + 10 = 82
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
188 - 186 = 2
186 - 182 = 4
182 - 6 = 176
176 - 8 = 168
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 585; (b) 82; (c) 176
