How do I make it print any number I say between 1 & 100?

I didn't know how to explain this one in the title. Anyway so I was messing around with return and I got an idea that involved math so I tried creating a script that printed out a sum of a math equation that the LocalPlayer says (Example: '1 + 1' -> '2') but I don't know how to make it detect the numbers of 1 to 100. Any help?

Edit: I was trying to use math.random but it doesn't seem to work because it picks 2 random numbers and not any value of 1 & 100 for what i'm trying to do.

function add(num1,num2)
	return num1 + num2
end

n1 = math.random(1,100)
n2 = math.random(1,100)

game.Players.LocalPlayer.Chatted:connect(function(msg)
	if msg:lower() == n1..' + '..n2 then
		local a = add(n1,n2)

		print(msg.." = "..a)
	end
end)

You can do what you're trying to through the use of string patterns and some useful string functions:

game.Players.LocalPlayer.Chatted:connect(function(msg)
	local n1, n2 = msg:match('(%d+)%s*%+%s*(%d+)');
	if n1 and n2 then
		n1 = tonumber(n1);
		n2 = tonumber(n2);
		if n1 > 0 and n1 < 101 and n2 > 0 and n2 < 101 then
			print(msg.." = "..n1+n2);
		end;
	end;
end)

Without understanding of what string patterns are and what they do, what's inside of the match function can seem like another language. I urge you to check out the above wiki page on string patterns.

Hope this helped.

EDIT: Edited to account for potential whitespace.