The order of teaching math topics in eighth grade may vary depending on the curriculum and teaching method used, but in general, a good starting point for teaching math in eighth grade would be:

1. Basic operations (addition, subtraction, multiplication, division) with integers, rational numbers, and decimals
2. Basic Algebraic concepts (including solving equations and graphing linear equations)
3. Geometry and measurement (including perimeter, area, volume, and angle measures)
4. Data analysis and probability (including mean, median, mode, range, and probability)
5. Basic geometry concepts (points, lines, planes, and symmetry)
6. Rounding and estimation
7. Basic concepts of geometry in 2D and 3D, including symmetry and transformations.
8. Basic concepts of equations and inequalities
9. Basic concepts of polynomials and factoring
10. Basic concepts of rational numbers and expressions
11. Basic concepts of probability and statistics
12. Basic concepts of function and function notation
13. Basic concepts of systems of equations and inequalities
14. Basic concepts of matrices
15. Basic concepts of exponential and logarithmic functions
16. Basic concepts of sequences and series
17. Basic concepts of trigonometry
18. Problem-solving and reasoning
19. Graphing and data interpretation
20. Mental Maths
21. Basic concepts of geometry and measurement conversions
22. Basic concepts of probability and statistics
23. Basic concepts of geometric probability