In Nemeth Braille notation, which digits are used for an open fraction?

• A. 2,3,4
• B. 1,4,5,6
• C. 3,4,6
• D. 7,8

Answer: (B)

In Nemeth Braille, writing fractions uses a specific signaling pattern to tell the reader that a fraction is present. For an open fraction, the marker that indicates the start of the fraction is made from a fixed group of digits. The digits chosen for this open-fraction marker are 1, 4, 5, and 6. This particular combination serves as a clear, unambiguous cue that what follows should be read as a numerator and a denominator, rather than as ordinary numbers or another mathematical construct. After this marker, you place the numerator digits and the denominator digits (with the usual numeric indicator as needed) to complete the fraction. The other digit sets listed wouldn’t reliably function as the open-fraction marker, so they wouldn’t correctly signal the fraction structure.