Complete the following number patterns.
- 710, 620, 530, , 350
- 37, 42, 48, 55, .
- 122, , 137, 144, 149
(a)
710 - 620 = 90
620 - 530 = 90
530 - 90 = 440
Pattern: Keep subtracting 90 from left to right.
(b)
42 - 37 = 5
48 - 42 = 6 (1 is added to 5)
55 - 48 = 7 (1 is added to 6)
7 + 1 = 8
55 + 8 = 63
Pattern: Keep adding 1 to the previous added number from left to right.
(c)
149 - 144 = 5
144 - 137 = 7
137 - 9 = 128
128 - 6 = 122
Pattern: Keep subtracting 2 from the previous subtracted number from right to left.
Answer(s): (a) 440; (b) 63; (c) 128
