Question

5 2/5 × 0.8A. 4.32B. 5.76C.7.80D.2.75

Answer 1

A. 4.32

Step-by-step explanation:

First, we need to transform the mixed number 5 2/5 into a decimal number as:

`5(2)/(5)=5+(2)/(5)=5+0.4=5.4`

Then, we can multiply 5.4 by 0.8, so:

`5(2)/(5)*0.8=5.4*0.8=4.32`

To multiply 5.4 by 0.8, we can multiply the numbers normally without taking into account the decimal points. So 54 times 08 is equal to:

Then, 5.4 has one digit after the decimal point and 0.8 has one digit after the decimal point. So, in total, we have two digits after the decimal point. It means that the result is equal to 4.32 because we need two digits after the decimal point.

Therefore, the answer is 4.32