'a = 100 and d = 15' a = 100 d = 15
'Evaluation for q and r' q = floor(a/d) 'q',q r = a - d*floor(a/d) 'r',r 'a',d*q+r
'SAGE has a built in modulo command' mod(a,d)
'a = -100 and d = 15' a = -100 d = 15