Complete the following number patterns.
- 511, 447, 383, , 255
- 39, 46, 54, 63, .
- 139, , 154, 159, 162
(a)
511 - 447 = 64
447 - 383 = 64
383 - 64 = 319
Pattern: Keep subtracting 64 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)
162 - 159 = 3
159 - 154 = 5
154 - 7 = 147
147 - 8 = 139
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 319; (b) 73; (c) 147
