math brain teasers

5*8=40 what is 5*-8

30*15

i add 5 to 9 and get two, how?

I am a odd number, take away an alphabet and i become even. What am i?

If 2 is company and 3 is a crowd what is 4 and 5

if 2=2, 3=6, 4=12, and 5=20 what does 6=?

what does pemdas mean?

Why was 6 afraid of 7?

If there are 15 apples and you take away 6 how many do you have

50*-2