Math problem (6.0-4.2=1.79)

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hi,
i have spent day troubleshooting issue calculations ending wrong , figured out this:
6-4.2 (six minus 4 point two) evaluates 1.7999999999999998
no matter how evaluate it...here how checked
trace(6-4.2);

the results funny when numbers fetched via parsefloat
6-parsefloat(4.2000000000000000000000) evaluates 1.8000000000000007
6-parsefloat(4.20000000000000000000000) evaluates 1.7999999999999998
can 1 clarify please?

yeah, known issue as, due way computers store data.

google , you'll find explanations , work arounds.

tracy


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