Write an equation that would express the 100 year total rainfall explain how the digits shifted position and why

268x10^2=126.8m

1 x 100 = 100
0.2 x 100 = 20
0.06 x 100 = 6
0.008 x 100 = 0.8

Each part of the number got 100 times as large so each one moved 2 places to the left. Multiply by 10 twice so it moves 2 places.