Complete the following number patterns.
- 751, 674, 597, , 443
- 22, 31, 41, 52, .
- 149, , 167, 173, 177
(a)
751 - 674 = 77
674 - 597 = 77
597 - 77 = 520
Pattern: Keep subtracting 77 from left to right.
(b)
31 - 22 = 9
41 - 31 = 10 (1 is added to 9)
52 - 41 = 11 (1 is added to 10)
11 + 1 = 12
52 + 12 = 64
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
177 - 173 = 4
173 - 167 = 6
167 - 8 = 159
159 - 10 = 149
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 520; (b) 64; (c) 159
