Find the sum and check the associative property of the addition $\left[\left(a+b\right)+c=a+\left(b+c\right)\right]$ for the following:

$324+72+93$

Find the sum and check the associative property of the addition $\left[\left(a+b\right)+c=a+\left(b+c\right)\right]$ for the following:

$784+93+38$

Find the sum and check the associative property of the addition $\left[\left(a+b\right)+c=a+\left(b+c\right)\right]$ for the following:

$3452+739+238$

Find the sum and check the associative property of the addition $\left[\left(a+b\right)+c=a+\left(b+c\right)\right]$ for the following:

$6324+4560+7213$

Find the sum by suitable rearrangement of terms for the following:

$943+417+657$

Find the sum by suitable rearrangement of terms for the following:

$12809+138+191+462$

Find the sum by suitable rearrangement of terms for the following:

$2395+10001+2645+9999$

Find the sum by suitable rearrangement of terms for the following:

$1+2+3+4+5+95+96+97+98+99$

Find the sum by suitable rearrangement of terms for the following:

$281+282+283+284+285+715+716+717+718+719$