There are several strategies that can help you develop better mental math skills:
1. Practice regularly by doing math problems in your head. 
2. Use visualization techniques to help you solve problems quickly. 
3. Use flashcards to help you memorize math facts
4. Use online tools and apps to help you practice and reinforce math concepts. (Math-Drills.com, Khan Academy, Mathway App, Math-Whiz App)

Finally, it may be helpful to break down complex problems into smaller, more manageable steps.
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