How do you 'end' a 'and', both commands?

The correct syntactical terminator for the condition of an if statement is "then".

For example:

if a and b then 
    --Do something
end

Or, alternatively:

if a then
    if b then
        --Do something if a and b
    end
    --Do something if just a
end

I hope this is what you were talking about, sorry if it isn't.

local Youdoyourmath = true

local a=NUM --Replace with number
local b=NUM --Replace with number
if a<b and Youdoyourmath then --If B > A (B over A) then
print(b) --Prints b
elseif a<b then --Elseif
print(a) --Prints a
end --The end for all the 'if' loops