ROUND DOWN TO SOMETHING

round down to something: translation

round off to something & round up to something & round down to something

to express a number in the nearest whole amount or nearest group of 1, 10, 100, 1,000, 1/10, 1/100, 1/1,000, etc. •

When doing taxes, Anne rounded her figures off to the nearest dollar.

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These census population figures are rounded up to the nearest million.