Multiply Decimals: Calculate 0.1 × 0.004 Step-by-Step

To solve this problem, we'll multiply the decimals as follows:

• Step 1: Multiply the whole numbers 1 and 4. This gives us 4.
• Step 2: Count the total number of decimal places in the factors. $0.1$ has 1 decimal place, and $0.004$ has 3 decimal places.
• Step 3: In the final answer, place the decimal point to ensure our product has $1 + 3 = 4$ decimal places.

Now, let's apply these steps:

First, multiply 1 by 4 to get 4. Then place the decimal in the product so it has 4 decimal places: $0.0004$.

Therefore, the solution to the problem is $0.0004$.