Complete the following number patterns.
- 554, 484, 414, , 274
- 39, 46, 54, 63, .
- 138, , 155, 162, 167
(a)
554 - 484 = 70
484 - 414 = 70
414 - 70 = 344
Pattern: Keep subtracting 70 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)
167 - 162 = 5
162 - 155 = 7
155 - 9 = 146
146 - 8 = 138
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 344; (b) 73; (c) 146
