As temperature increases, the of marble will also increase

As temperature increases, the GRAIN SIZE of marble will also increases. Marble is a non foliated metamorphic rock. Metamorphic rocks are rocks that had change forms as a result of heat and pressure. Temperature and pressure have diverse effects on metamorphic rocks, but for marble, as the temperature increases, the grain size of the rock also increases.

Idid the calculation and i get 875,000,000 which can be written as 8.75 x 10^6?