## !

There is a possible problem with this:

The six numbers may add to more than the total population and the six percentages may add to more than 100 percent because individuals may report more than one race.

Shouldn't it be add UP to?

• Yes, because as it is, it really means the number will pile on top of existing values. In this context, that sense of add to (thereby increasing) does not make sense. What is intended is together amount to, which is add up to. This is only in the semantic sense. Grammar-wise the expressions are still valid, though.
– Kris
Nov 26, 2012 at 11:21
• I think "equal" could replace both instances and suffice. Nov 26, 2012 at 13:46
• In my opinion, both are OK. The numbers add up to 100. The numbers add to 100. Now, with multiply I would just say "The numbers multiply to 100" and not "multiply up". Nov 26, 2012 at 15:16

Grammar isn't really the issue here. It's both pedantic and wrong to suppose numbers can only be "added to" other numbers, or "add up to" a total. It's true that in OP's context, "up" would normally be included - for example, the numbers add up to {some total X} is about four times more common than the numbers add to X, but that's just idiomatic preference. Consider...