"One plus three equals four."

Translation: Satu tambah tiga sama dengan empat.

[MikeWilby]

so what was wrong with satu dan tiga?

[Away54]

MikeWilby, "satu dan tiga" means "one and two." But, the sentence above indicates a mathematical addition. So, "plus" here means "tambah/ditambah".

[PixelSnader]

What is the difference between:

X tambah Y
X dengan Y
X dan Y

?

[Away54]

PixelSnader,

1. 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".

2. X dengan Y -> X is with Y (or did you want to say, "X sama dengan Y" ? This will be, "X = Y")

3. X dan Y -> X and Y (or "X & Y" so then it becomes a boolean equation)