Highly recommend.
This is truly an outstanding app. I have the paid version. More than worth the cost.
I use this on a regular basis and find myself slapping my head. But I am getting better at math. Not from slapping my head, but rather from doing the challenges. There is an outstanding training section on techniques for various factors, along with an entire list for multiplication and division.
This is very very frustrating at first. But it does get you better at math. The techniques for breaking down numbers to do multiplication and division are very clever. There are some I had not seen anywhere before. They are really worth taking the time to try.
There are various challenges and different modes. Try the one called To the bitter end. You have 20 seconds to do a problem. It might sound like enough time, but you will be challenged.
Very highly recommend.
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