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Microsoft founder, philanthropist and the second wealthiest person in the world Bill Gates certainly has many prestigious titles on his resume, but one thing he cannot claim to be is a savvy grocery shopper.

Appearing on “The Ellen DeGeneres Show” for the first time this week, the mogul completed a “Price is Right”-style challenge with the longtime talk show host, in which he was tasked with guessing the prices of five common grocery store staples to within a dollar.

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"We're going to test your knowledge of some everyday items that you get at the supermarket. When was the last time that you have been at a supermarket?" DeGeneres asked.

"A long time ago," Gates laughed.

Gates incorrectly guessed that a $1 box of Rice-a-Roni cost $5, and that a $19 container of Tide Pods was $10, and seemed endearingly surprised that the items weren’t as expensive as he initially thought.

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DeGeneres and the studio audience then coached Gates through correctly guessing that a $3.78 dental floss was in the $4 range, a bag of Totino’s Pizza Rolls cost not $20 but $8.98, and that TGI Friday’s Spinach Artichoke Cheese Dip was not $10, but rather $3.66.

While the 62-year-old tycoon may not be the most informed companion for your next grocery run, he has long been committed to bettering the world with his $91.1 billion fortune. Gates and his wife Melinda intend to give the majority of their wealth to charity for various humanitarian causes, according to Business Insider and other reports.

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