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Identity property of addition

(1+2)+4 = 1+(2+4)

What is 3 plus 7?    Answer is 10

What is seven hundred and ninety-five plus two hundred and sixty-three?  Answer 1058

What is 25 more than 256?  Answer 231

Add 969 and 310? Answer 

What is 15 minus 9? 

What is 417 more than 645?

4×7

28

twenty-eight

the sum of divisors | 4

7

1 | 2 | 4 (3 divisors)

4 = 2^2 (2 prime factors, 1 distinct)