Complete the following number patterns.
- 862, 772, 682, , 502
- 48, 55, 63, 72, .
- 113, , 128, 133, 136
(a)
862 - 772 = 90
772 - 682 = 90
682 - 90 = 592
Pattern: Keep subtracting 90 from left to right.
(b)
55 - 48 = 7
63 - 55 = 8 (1 is added to 7)
72 - 63 = 9 (1 is added to 8)
9 + 1 = 10
72 + 10 = 82
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
136 - 133 = 3
133 - 128 = 5
128 - 7 = 121
121 - 8 = 113
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 592; (b) 82; (c) 121
