Final answer:
The product of 3.9 and 0.05 is 0.195. Multiply the numbers as whole numbers and then adjust the decimal point based on the initial decimal places.
Step-by-step explanation:
To find the product of 3.9×0.05, we start by multiplying the numbers as if they were both whole numbers. Calculating 39 × 5 gives us 195. Then, we count the total number of decimal places in the original numbers, which is three (two in 3.9 and one in 0.05). To place the decimal correctly in our answer, we move the decimal point in 195 three places to the left, which gives us 0.195 as the final product.