We have a scale at home that does not work properly. It adds three kilos to your original weight. If my mom weighed herself and had sixty kilos, could I ask her: ''Didn't you forget to subtract the three kilos?''?
Is the word 'subtract' the one I should use?
Thank you.
"subtract" is fine. g. based on the weight she told you.
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"subtract" is fine.
''Didn't you forget to subtract the three kilos?'' suggests that you believe she did forget, e.g. based on the weight she told you.
For a more neutral question, ask ''Did you remember to subtract the three kilos?''