My son has a math problem that asks five different names of 7.5. I am having a problem helping him figure out what he is missing.

This is what he has so far: 7.5, 7 1/2, seven ones and five tenths, seven and one-half

HELP??

How about
* Half of 15
* Six and 1.5
* Thirty six fifths, etc.

... are those acceptable "names"?

How about 7.500 (seven & five hundred thousandths)