Mental Math Level 1 encompasses various skills suitable for children aged 6 to 9. These skills include:

1. Counting On
2. Counting Back
3. Counting On or Back
4. Double the single digit number
5. Ten to teen
6. Plus One Fact
7. Plus Two Fact
8. Plus Three Fact
9. One more than a number
10. One less than a number
11. Two more than a number
12. Two less than a number
13. one more or less than a number
14. Two more or less than a number
15. One and Two more or Less than a number
16. Skip Counting by One
17. Skip Counting by Two
18. Double Plus One More Group
19. Skip Counting by One, Two or Three

These skills are designed to be easily comprehensible and engaging for children in the specified age range, allowing them to develop their mental math abilities effectively.