# What's wrong with my calculator? [duplicate]

It is giving some very strange answers to some very simple addition. I tried adding 1 to the numbers and that was strange:

1 + 1 = 1
1 + 2 = ERROR
1 + 3 = 3
1 + 4 = 4
1 + 5 = 9
1 + 6 = 8
1 + 7 = 7
1 + 8 = 8
1 + 9 = 9


So I tried a few more, also with strange results:

2 + 4 = 8
2 + 5 = 8
3 + 4 = 9


Why is it acting so strange?

• Ah, yes. It is in fact a dupe of that. Bummer. – Forklift Jun 5 '17 at 16:17