Question

question 4 of 8
which shows the correct setup to multiply the decimals?
3.345·6.4
3345
· 64
3345
· 64
3.345
· 6.4
3345
·6400

Explanation:

Step1: Convert decimals to integers

$3.345 = 3345 \times 10^{-3}$, $6.4 = 64 \times 10^{-1}$

Step2: Set up integer multiplication

To multiply the decimals, we first set up the multiplication of their integer equivalents:

$$\begin{align} &3345\\ &\underline{\times\ \ 64} \end{align}$$

(Note: The first two options are identical in the image; this is the correct integer setup, and we account for decimal places later.)

Answer:

A.

$$\begin{align} &3345\\ &\underline{\times\ \ 64} \end{align}$$

(and the identical second option, as they match the correct integer setup for decimal multiplication)