3+5+1+2+3=???©

my father used too say this when i got 'C' for mathematic

''wad so hard its jst number from 1-9 and plus minus divide times oni la, can get 'C' for that ''

in my heart i was thinking '' u forgotten the square, root, algebric n more''

anyway

have u ever wondered wad is numbers?

now here's the answer