Complete the following number patterns.
- 774, 686, 598, , 422
- 38, 47, 57, 68, .
- 162, , 180, 186, 190
(a)
774 - 686 = 88
686 - 598 = 88
598 - 88 = 510
Pattern: Keep subtracting 88 from left to right.
(b)
47 - 38 = 9
57 - 47 = 10 (1 is added to 9)
68 - 57 = 11 (1 is added to 10)
11 + 1 = 12
68 + 12 = 80
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
190 - 186 = 4
186 - 180 = 6
180 - 8 = 172
172 - 10 = 162
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 510; (b) 80; (c) 172
