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Math Workout?
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Popularity Score: 5
This app was mentioned in 5 comments, with an average of 1.00 upvote
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Download the MathWorkout app and practice.
Do it until every problem is really easy.
https://play.google.com/store/apps/details?id=com.akbur.mathsworkout&hl=en
https://itunes.apple.com/us/app/math-workout/id497620537?mt=8
One tip, ROUND A LOT...
18*37 is hard...
(20-2)*(40-3) is not as hard.
800-60-80+6 = 666
Yes, that example was evil.
One thing to note is that you can find/check the LAST digit pretty easily... 8*7= 56... the last digit is 6.
For what it's worth, 169q, 165v, 5.5awa. Self-studied while working full time.
I use this math app when I'm on the toilet.
I think it's a little hard to relapse while you're doing math exercises as fast as you can :P. Also it's good for your brain.
For counting down quickly I'd recommend this Android app called Math Workout. It has modes for addition/substraction and multiplication/division and a combination of both for basic practise. In addition it has a mode where you can start with a number and without writing down the intermediates you need to do these operations (e.g. add 8, divide by 6 etc.) under time pressure. By training couple of minutes daily you are able to improve really quickly. There are many other that have similar properties that you might want to look into.
To calculate probabilities of complex situations (Knife juggler and Muster + Hero power wiping a board of four imps for example) I recommend writing down the tree diagram on paper until you can do these in you head. To learn how to draw tree diagrams, check out this video and for more detailed explanation watch this video.
Honestly the best way to learn to calculate anything (fatigue damage, lethal, etc.) quickly is by practising simple calculations a lot. Use one of the many apps for your phone and practise daily. Use a calculator only to check your answer in everyday situations be it online orders or restaurant bills. Also don't let "I sucked at high school math" bother you, you can learn math at any age by practising!
Math workout is great.