Question

Evaluate the following expression:

$4.2\cdot 8.1$

Short answer

The value $4.2\cdot 8.1$is $34.02$.

Step-by-step solution

Step 1. Given information.

The given expression is:

$4.2\cdot 8.1$

Step 2. Write the concept.

The rule for multiplying decimals is:

1. Multiply ignoring the decimal.
2. Count the number of spaces to the right of the decimals.
3. Move the decimals the same number of spaces to the left in the product.

Step 3. Simplify the expression.

The expression $4.2\cdot 8.1$can be simplified as in below.

role="math" localid="1642067222681" $\begin{array}{c}4.2\cdot 8.1=4.2\times 8.1\\ =34.02\end{array}$