Complete the following number patterns.
- 902, 849, 796, , 690
- 21, 26, 32, 39, .
- 120, , 133, 138, 141
(a)
902 - 849 = 53
849 - 796 = 53
796 - 53 = 743
Pattern: Keep subtracting 53 from left to right.
(b)
26 - 21 = 5
32 - 26 = 6 (1 is added to 5)
39 - 32 = 7 (1 is added to 6)
7 + 1 = 8
39 + 8 = 47
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
141 - 138 = 3
138 - 133 = 5
133 - 7 = 126
126 - 6 = 120
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 743; (b) 47; (c) 126
