5-3 is 2 multiply that by 3 and you get 6 add that to 53 and you get 59... using PEMDAS
315 did
therefore
360-315=45 didnt
45/360 students didnt go on the trip
so to turn this into a percentage, just multiply this fraction by 100:
45/360*100 = 12.5%
(6 - 2) - 1 = 4 - 1 = 3
6 - (2 - 1) = 6 - 1 = 5
The associative rule doesn't work for subtraction because you get different results when you move the parentheses.
