Math Bath

Four rubber duckies floating in the tub, singing rub a dub dub, one float away, there’s only three rubber duckies floating in the tub, singing rub a dub dub, another float away, you only have two rubber duckies floating in the tub, singing rub a dub dub, two rubber duckies floating in the tub, singing rub a dub dub, one float away, you only have one rubber ducky, sitting in the tub, he’ll be lonely but he will still sing rub a dub dub.