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Is there a verb that fits in the pattern: quarter, third, halve (divide), [???], double, triple, quadruple. . .?

If these were nouns, I would assume "single" fits in between: 1/4, 1/3, 1/2, 1, 2, 3, 4 . . . quarter, third, half, single or one, double, triple, quadruple . . . Note that each word has a ...