Complete the following number patterns.
- 655, 595, 535, , 415
- 42, 47, 53, 60, .
- 46, , 61, 68, 73
(a)
655 - 595 = 60
595 - 535 = 60
535 - 60 = 475
Pattern: Keep subtracting 60 from left to right.
(b)
47 - 42 = 5
53 - 47 = 6 (1 is added to 5)
60 - 53 = 7 (1 is added to 6)
7 + 1 = 8
60 + 8 = 68
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
73 - 68 = 5
68 - 61 = 7
61 - 9 = 52
52 - 6 = 46
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 475; (b) 68; (c) 52
