Question

determine the sum given below using a suitable rearrangement 2+3+4+5+65+66+67+68

Answer 1

$=2 + 3 + 4 + 5 + 65 + 66 + 67 + 68$

$=(2 + 3 + 4 + 5) + (65 + 66 + 67 + 68)$

$(Using \: associative \: property \: of \: addition)$

$=14 + 266$

$=280$