Here are the completed skip counting series for each problem. I have found the pattern (the number we add or subtract each time) and filled in the missing blanks.
1)
Pattern: Add 5
-15, -10, -5,
0,
5,
10,
15,
20,
25,
30
2)
Pattern: Add 3
0,
3,
6, 9, 12,
15,
18,
21, 24,
27
3)
Pattern: Add 4
96,
100, 104,
108, 112,
116,
120,
124,
128, 132
4)
Pattern: Add 6
-109, -103,
-97,
-91, -85, -79,
-73,
-67,
-61,
-55
5)
Pattern: Add 3
893, 896,
899,
902, 905, 908,
911,
914,
917,
920
6)
Pattern: Add 4
-690,
-686,
-682,
-678,
-674, -674,
-670, -666,
-662, -658
*(Note: The printed number -674 appears twice in a row in this problem, so the pattern continues by adding 4 from there.)*
7)
Pattern: Add 50
200,
250,
300, 350,
400,
450,
500,
550,
600, 650
8)
Pattern: Add 25
400,
425,
450,
475,
500,
525,
550, 575,
600, 625
9)
Pattern: Add 4
54,
58, 62,
66,
70,
74,
78,
82, 86, 90
10)
Pattern: Add 8
81,
89,
97,
105,
113, 121,
129, 137,
145,
153
11)
Pattern: Add 10
46,
56,
66,
76,
86, 96,
106, 116,
126,
136
12)
Pattern: Add 20
8, 28,
48,
68,
88,
108,
128,
148,
168, 188
Parent Tip: Review the logic above to help your child master the concept of skip counting worksheet grade.