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For a summation, add the smaller numbers first. Smaller as in 0.0000000000053, not like -5172365126.

For summation just go with Kahan summation or some improved variant of it https://en.wikipedia.org/wiki/Kahan_summation_algorithm

And if you can't remember that, you can use a pairwise summation like (((a+b)+(c+d))+((e+f)+(g+h)))+... which gives a decent error reduction in return.

how about small as in ²³⁷

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