Two and two

  1. Two and two makes four.
    1a. Two and two make four.
    Which sentence is correct?

I was reading a post. It says both are correct.


May I add something that might interest you:

According to "[i]Understanding and Using English Grammar'[/i]' ([i]B.Sch. Azar[/i])

Arithmetic expressions require singular verbs:

(1) Two and two is four.
(2) Two and two equals four.
(3) Two plus two is/equals four.
(4) Five times five is twenty five.

According to “Practical English Usage” (M.Swan),

Singular verbs are often possible after plural number subjects in spoken calculations.

(1) Two and two [b]is/are[/b] for.
(2) Ten times five [b]is[/b] fifty, (OR Ten fives are fifty.)

  It's up to you to conclude. :-)

Two and two make four.
Two and two is four.
Two and two are four.

‘makes’ sounds wrong.

“Two and two equal/equals four.”
In this sentence, should I use ‘equal’ or ‘equals’?

Both are possible, depending on the focus, but usually:

two and two (when brought together) equal [are the same as] four.