Complete the following number patterns.
- 814, 721, 628, , 442
- 48, 57, 67, 78, .
- 76, , 92, 96, 98
(a)
814 - 721 = 93
721 - 628 = 93
628 - 93 = 535
Pattern: Keep subtracting 93 from left to right.
(b)
57 - 48 = 9
67 - 57 = 10 (1 is added to 9)
78 - 67 = 11 (1 is added to 10)
11 + 1 = 12
78 + 12 = 90
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
98 - 96 = 2
96 - 92 = 4
92 - 6 = 86
86 - 10 = 76
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 535; (b) 90; (c) 86
