In glycolysis, the six-carbon sugar glucose is split molecules of pyruvate.

During glycolysis glucose is  converted to fructose  through rearrangement of its atoms. To this fructose are added two phosphate  molecules which becomes fructose-1,6 biphosphate because the phosphate molecules are attached at carbon 1 and 6  of the fructose.

This phosphorylated fructose molecule is then split into two 3-carbon molecules to form a couple of glucose- 3- phosphate (G3P) molecules, each of which gains another phosphate molecule.

Finally these two G3P molecules transfer their phosphate molecules to electron carriers and they each becomes a  pyruvate.

So the glucose molecule is split into two pyruvate molecules.

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