91Ó°ÊÓ

The product of two integers with the same sign is always positive.

The product of two integers with opposite signs is always negative.

To find the product of two decimal numbers, first, multiply the numbers normally without a decimal point.

Then place the decimal point in the final product before the same count of digits from the right end, as the total count of digits after decimal in both the numbers that are multiplied.

To find the product of the decimal numbers 2.4 and –0.7, first, multiply the numbers normally without a decimal point.

Observe that the number of digits after decimal in these numbers are 2, so place the decimal point in the final product at the left of the last two digits from the right end.

$$\begin{gathered} 2.4\left(−0.7\right)=−\left(2.4×0.7\right) \\ =−3.43 \end{gathered}$$

Therefore, the product is $−3.43$.