Interestingly, the iPad split (software) keyboard chose "both". For en-US (I don't know if it varies by region), the 6 key is drawn on the right side. However,

Interestingly, the iPad split (software) keyboard chose "both". For en-US (I don't know if it varies by region), the 6 key is drawn on the right side. However, you can happily tap where it would be with your left index finger and it'll type a 6.