n has learned an algorithm for subtraction. She uses it to find $53-18$ as follows.

$+10=63so53+10=50+13$

$(18+10)=-28so-(18+10)=-(20+8)$

answer is $30+5=35.$

at properties does Carmen's algorithm use? Is her method correct?

w solve another subtraction problem, $72-36,$ with Carmen's algorithm. Use the traditional algorithm to check your work.

ich properties of addition does Carmen's algorithm use? Select all that apply.

Associative property

Transitivity property

Closure property

None of the above