Math help..... ahhh.. it's order of operations! help!?

Question

ok.. please help me with this.. 1/3 (3*3) + 18........

and then ..... 2.5 * .25 divided by 5...for the first one i got 18.3.. is that even close to being right?? for the second question i got 0.125

...???

Answer 1

does ur teacher teach you Please Excuse My Dear Aunt Sally

it helps each big letter represents something

P: ( )

E:exponents

M: multiplication

D; division

A;addition

S: subtraction

multiplication and division doesn't matter which one comes first but they do come before addition and subtraction

so in the first one

you would multiply 3 times 3 equals 9 then multiply 1/3 which equals to 3 then add 18 which is 21

for the second one you multiply 2.5 times .25 which equals which is .625 then divide by 5 which gives you the answer you got 0.125

good luck with the trick i showed you

Please Excuse My Dear Aunt Sally

Answer 2

a) 1/3 (3*3) = (1/3)* (3*3) = 3*3 / 3 = 3

so  1/3 (3*3) + 18 = 3 + 18 = 21

b) 2.5 * 0.25 = 10/4 * ¼ = 10 / 16 = 5 / 8

so   (2.5 * 0.25) / 5 = (5 / 8) / 5 = 1 / 8 = 0.125

Answer 3

1/3 (3*3) + 18.

1/3*9 + 18

one third of 9 is 3 so

3+18=21

2.5 * .25 / 5

.625 / 5

.125

you were wrong for the first one but right for the second one. just keep trying and i hope my source was helpful.

Answer 4

ok, that makes no since. Your confusing me. One way to remember order of opperations is: "Please (parenthesis), Excuse (exponent), My ) Dear (multiply, division) Aunt Sally (add, subtract). GOOD LUCK! (: