We multiply the decimals as numbers (as if there is no decimal points)
We count the number of digits after the decimal point in each and the sum will be the number of digits after the decimal point of the product
a.1.1 x 0.3 = 0.33
b.70 x 0.9 = 7 x 9 = 63
c. 20 x 0.09 = 2 x 0.9 = 1.8
