I have heard a lot of people using the word “substract”, respectively its derived form “substraction”. Long story short, the correct forms are “subtract” and “subtraction” (without “s”).
The reason why so many English learners make the mistake is probably that there is a corresponding word in many languages that does contain an “s”, e.g. soustraire in French or sustraer in Spanish. Another reason might be that learners confuse its sound with “abstract”, a relatively common word that contains the letter group “bstract”, not just “btract”.
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