Ch4+2o2=co2+2h2o
co2+cao
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CH4: C has an oxidation state of -4 and H has an oxidation state of +1.
O2: O has an oxidation state of 0.
CO2: C has an oxidation state of +4 and O has an oxidation state of -2.
H2O: H has an oxidation state of +1 and O has an oxidation state of -2.

CO2: C has an oxidation state of +4 and O has an oxidation state of -2.
CaO: Ca has an oxidation state of +2 and O has an oxidation state of -2.