Question 114727


{{{20 + 15 = _____ + 20}}}......use the properties of addition 

remember {{{Commutative }}}{{{property}}}: 
When two numbers are added, {{{the}}}{{{ sum}}}{{{ is}}}{{{ the}}}{{{ same}}} regardless of the {{{order}}} of the addends. 

For example {{{4 + 2 = 2 + 4 }}}

so, you will have:

{{{20 + 15 = 15 + 20}}}......