"One plus three equals four."
Translation:Satu tambah tiga sama dengan empat.
X tambah Y -> X is added to Y ("X + Y", it is mathematical addition). For a more formal way, we say it, " X ditambah Y".
X dengan Y -> X is with Y (or did you want to say, "X sama dengan Y" ? This will be, "X = Y")
X dan Y -> X and Y (or "X & Y" so then it becomes a boolean equation)