Anna puts three slices of ham in each sandwich. If she has 31 slices of ham, how many more slices of ham does she need to make 50 ham sandwiches?
##Solution## Anna needs 3 x 50 = <<3*50=150>>150 slices of ham to make 50 sandwiches.
Anna needs 150 - 31 = <<150-31=119>>119 more slices of ham
#### 119