Complete the following number patterns.
- 664, 606, 548, , 432
- 22, 28, 35, 43, .
- 78, , 94, 101, 106
(a)
664 - 606 = 58
606 - 548 = 58
548 - 58 = 490
Pattern: Keep subtracting 58 from left to right.
(b)
28 - 22 = 6
35 - 28 = 7 (1 is added to 6)
43 - 35 = 8 (1 is added to 7)
8 + 1 = 9
43 + 9 = 52
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
106 - 101 = 5
101 - 94 = 7
94 - 9 = 85
85 - 7 = 78
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 490; (b) 52; (c) 85
