I cannot understand why she did that, it really doesn't add up

I cannot understand why she did that, it really doesn't add up. (*) doesn't calculate (*) isn't mathematics (*) doesn't make sense (*) makes the wrong addition


This is a companion discussion topic for the original entry at https://english.best/questions/23233,i-cannot-understand-why-she-did-that-it-really-udoesnt-add-upu/
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I cannot understand why she did that, it really doesn’t add up.
doesn’t make sense

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We often say that something ‘doesn’t add up’ when we are suspicious or disbelieving:
He said he earnt the money for his Ferrari by waiting tables. Something doesn’t quite add up’.

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