Complete the following number patterns.
- 606, 522, 438, , 270
- 38, 46, 55, 65, .
- 61, , 77, 82, 85
(a)
606 - 522 = 84
522 - 438 = 84
438 - 84 = 354
Pattern: Keep subtracting 84 from left to right.
(b)
46 - 38 = 8
55 - 46 = 9 (1 is added to 8)
65 - 55 = 10 (1 is added to 9)
10 + 1 = 11
65 + 11 = 76
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
85 - 82 = 3
82 - 77 = 5
77 - 7 = 70
70 - 9 = 61
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 354; (b) 76; (c) 70
