add up
US /æd ˈʌp/
UK /æd ˈʌp/

1.
tenir la route, concorde
to make sense; to seem reasonable or logical
:
•
His story just doesn't add up.
Son histoire ne tient tout simplement pas la route.
•
The numbers don't add up, there must be a mistake.
Les chiffres ne concordent pas, il doit y avoir une erreur.