To what extent is knowledge gained in Mathematics similar and/or different to knowledge gained in History?

the knowledge gained in mathematics is different than the one gained in history.
history is words and the past, math is numbers and abstract concepts.
the only thing in which they are similar is that both are not certain. you can't know if 2 + 2= 4 and you can't know if hitler existed because we weren't there. we can only trust it and look at facts that "show" it is true.
the knowledge gained is used in many different forms and they are not  applied in the same subjects or materials.
math and history are both ways to gain knowledge but different knowledge.