1.) The easy way to multiply in your head is the following. 13 x 13= 169. You add the second 3 to 13 which is 16 then you do 3×3 which is 9. Giving your answer of 169.
2.) If you are lost while taking a math exam simply write down a bunch of numbers and draw arrows all over the paper to show the teacher you are at least trying in hopes of partial credit. If called for throw in some letters as well.
3.) You lose 382,984 math street cred points answering those stupid order of operations things on Facebook, even if you’re right.