Complete the following number patterns.
- 589, 513, 437, , 285
- 23, 31, 40, 50, .
- 130, , 148, 155, 160
(a)
589 - 513 = 76
513 - 437 = 76
437 - 76 = 361
Pattern: Keep subtracting 76 from left to right.
(b)
31 - 23 = 8
40 - 31 = 9 (1 is added to 8)
50 - 40 = 10 (1 is added to 9)
10 + 1 = 11
50 + 11 = 61
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
160 - 155 = 5
155 - 148 = 7
148 - 9 = 139
139 - 9 = 130
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 361; (b) 61; (c) 139
