Maths

IALT:Show how I got the Answer and how to solve the answer 

Today me and my class was doing maths and that we were learning about how to find Fraction of a set using multiplication and division.

And me and my friend was working on our maths work about Fraction and that the answer I was doing was 2/5 of 81 I know this becuase 81/9=9 and 9x9=81 becuase the 2 repersent the 2/5 Now that I know what 2/5 of 81 =9

What I need to work on is how to show them how i work it out and to be albe to exsplame them.

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Thanks:)