Which of the following is correct?

1 + 1 should equal 2.

1 + 1 should equal to 2.

"equal" or "equal to"?

  • 1
    Either the first one, or you could say, "1+1 should be equal to 2," if you wanted a more verbose version. – J.R. Dec 26 '15 at 8:54

In maths, it's widely used the word equals.
Given the suggestions, 1 + 1 should be equal to 2 is the proper choice. Using equals is just 1 + 1 equals 2.

Now in maths, should is not used when we are sure about the result. After working long calculations and having in mind what's the expected result, we introduce should.

  • 1
    "1 + 1 should be equal to 2" is not one of the choices presented. I hope that the OP accepting this answer does not mean that he thinks that there is anything wrong with saying "1 + 1 should equal 2" - there isn't. – Adam May 15 '17 at 5:46

No preposition needed. "One plus one should equal two".

However, if equal is used as an adjective, "to" is needed. "One plus one should be equal to two."

  • @Freewind - although you have accepted the other answer, please read this one also, since it actually answers your question. – Adam May 17 '17 at 19:26

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