I was so impressed with this app that I purchased it. I love practicing using the abacus and this app really delivers excellent training. They explained the friends concept with small and large compliments and cover addition, subtraction, multiplication, and division. Correct finger movements are taught as well and it teaches you how to transition from a physical abacus to using mental math - calculating all the math in your head. This is something that should be taught from a young age. Just like reading, math can be learned as soon as they start speaking and earlier.
I have no complaints.
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