Why does App Inventor make mistakes with decimals?
1*.0000000001 = 0.0000000001000000000000000036432197315498
_36432197315498 It shouldn't exist
1*.000001 = 0.0000009999999999999999547481118258862587
floating-point imprecision is a common issue in many systems, not just App Inventor. For critical calculations that require exact decimal values, it's best to work with integers or round the results appropriately.
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See the first few links