Complete the following number patterns.
- 689, 601, 513, , 337
- 27, 32, 38, 45, .
- 119, , 132, 137, 140
(a)
689 - 601 = 88
601 - 513 = 88
513 - 88 = 425
Pattern: Keep subtracting 88 from left to right.
(b)
32 - 27 = 5
38 - 32 = 6 (1 is added to 5)
45 - 38 = 7 (1 is added to 6)
7 + 1 = 8
45 + 8 = 53
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
140 - 137 = 3
137 - 132 = 5
132 - 7 = 125
125 - 6 = 119
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 425; (b) 53; (c) 125
