Half of 5 is 2.5. So, 2 four times is 8. Then you have .5 four times. That is two. Total is 10. That is how I figured it out in my head. Keepng the wholes and fractions might make it easier for you next time.
I have always told my children that if you don't have anything nice to say.....say nothing at all. There are ways to get one's point across without being hurtful.
OP....we are happy to help with homework, and luv2bnrn was very nice to provide the answer for you, but that will not help you learn how to do calculations.....a huge part of nursing. I like to see what you have done so far so I may be better able to help you and teach you how to find the answer yourself.