The new phenomena of 'girl' and 'boy' math is taking by storm as Gen Z shoppers bizarrely claim using cash doesn't count as spending money and anything under $5 is effectively free. Consumers are sharing their often illogical justifications for making purchasing under the hashtags. In dozens of videos, people find ways to convince themselves they have either saved - or even made - money while buying things.TikTok user McKenna explained the rules of 'girl math' simply as: 'Anything under $5 is free, anything I buy with a gift card is free.'
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