Complete the following number patterns.
- 772, 705, 638, , 504
- 23, 32, 42, 53, .
- 123, , 140, 145, 148
(a)
772 - 705 = 67
705 - 638 = 67
638 - 67 = 571
Pattern: Keep subtracting 67 from left to right.
(b)
32 - 23 = 9
42 - 32 = 10 (1 is added to 9)
53 - 42 = 11 (1 is added to 10)
11 + 1 = 12
53 + 12 = 65
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
148 - 145 = 3
145 - 140 = 5
140 - 7 = 133
133 - 10 = 123
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 571; (b) 65; (c) 133
