bonjour

6.3 = 63/10

9.75 = 975/100

4 = 40/10

0.59 = 59/100

0.08 = 8 /100

90 = 9 000/100

89.52 =  89 + 5/10 + 2/100

6.708 = 6 + 7/10 + 8/1000

continue

483.2 =  ( 4 x 100 ) + ( 8 x 10 ) + ( 3 x 1 ) +  ( 2 x 0.1 )

6.789 = ( 6 x 1 ) + ( 7 x 0.1 ) + ( 8 x 0.01 ) + ( 9 x 0.001 )

continue