>>13499188Evaluate your objective baseline performance across math domains. What are the likely areas you need mental math?
>Solving simple algebra on teachers chalkboard>Calculating change at a store>Eyeballing geometry during crafts>Converting between measurements>Approximating complex fractions>Manipulating decimal points>Dealing with orders of magnitude between units>Passage of analog time and timezone mathAnd so on.
Find some tests for mental math, even gradeschool ones. 50-100 questions would be good, with several practice tests. Use a speed chess app and give yourself no more than a minute per question. At the end, grade the number correct, incorrect, or passed. Also score them by the general domain (geometry). This would be your baseline.
Like others suggest, use mental math games. A wide variety of different game apps are good because you want to wide exposure to different problem styles. If you struggle with certain mental math areas, find more specific games.
It can be helpful to read books on mental math but many of the learning games teach you the same heuristics. Be aware some books spread myths. If a popular technique does not increase your speed and accuracy after weeks of trying, it doesn't work for you. Drop it.
Practice at least three times a week for at least 20 minutes. Practicing more frequently during short burst is even better.
Once a month re-test your baseline using a new but similar test to the original baseline test.
Over time you want to see your speed, accuracy, and completions on the ongoing baseline tests improve.
