Easy · Set 19

8 problems
1
Input: 8 → [×2] → ? =
2
Input: 10 → [?] → 12, what is the rule? =
3
Input: 10 → [?] → 9, what is the rule? =
4
Input: 4 → [?] → 20, what is the rule? =
5
Input: 1 → [+5] → ? =
6
Input: 5 → [+2] → ? =
7
Input: 4 → [+2] → ? =
8
Input: 5 → [+10] → ? =
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