I think maybe if you start a thread on the Gen ed board and gave more specifics regarding age of child, stuff you have tried, etc. you might get meatier responses than here.
Math is one subject that cannot be shortchanged with regards to instructional time. 95% of kids need direct and intentional instruction. If you don't have the time, you will need to outsource the subject or change your educational plans.
We switched from Singapore Primary Mathematics to Saxon Pre-Algebra, after 6th grade. We also switched the younger ones to CLE from Singapore and it has been PERFECT!!!