Complete the following number patterns.
- 987, 916, 845, , 703
- 33, 43, 54, 66, .
- 156, , 175, 181, 185
(a)
987 - 916 = 71
916 - 845 = 71
845 - 71 = 774
Pattern: Keep subtracting 71 from left to right.
(b)
43 - 33 = 10
54 - 43 = 11 (1 is added to 10)
66 - 54 = 12 (1 is added to 11)
12 + 1 = 13
66 + 13 = 79
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
185 - 181 = 4
181 - 175 = 6
175 - 8 = 167
167 - 11 = 156
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 774; (b) 79; (c) 167
