Complete the following number patterns.
- 777, 701, 625, , 473
- 21, 30, 40, 51, .
- 104, , 120, 124, 126
(a)
777 - 701 = 76
701 - 625 = 76
625 - 76 = 549
Pattern: Keep subtracting 76 from left to right.
(b)
30 - 21 = 9
40 - 30 = 10 (1 is added to 9)
51 - 40 = 11 (1 is added to 10)
11 + 1 = 12
51 + 12 = 63
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
126 - 124 = 2
124 - 120 = 4
120 - 6 = 114
114 - 10 = 104
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 549; (b) 63; (c) 114
