Complete the following number patterns.
- 593, 528, 463, , 333
- 49, 58, 68, 79, .
- 170, , 187, 192, 195
(a)
593 - 528 = 65
528 - 463 = 65
463 - 65 = 398
Pattern: Keep subtracting 65 from left to right.
(b)
58 - 49 = 9
68 - 58 = 10 (1 is added to 9)
79 - 68 = 11 (1 is added to 10)
11 + 1 = 12
79 + 12 = 91
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
195 - 192 = 3
192 - 187 = 5
187 - 7 = 180
180 - 10 = 170
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 398; (b) 91; (c) 180
