On the last board each fraction with denominator 3, 5, 15, 30, or 60 can be represented as the sum of unit fractions. Positive Whole Numbers The board holds 6 + 1 = 7. The board holds 10 + 5 + 4 + 4 = 23. Negative Whole Numbers The board holds - 30 - 5 - 12 - 12 - 3 - 4 = -66. Fractions The board holds 1/2 + 1/3 + 1/6 + 1/15 + 1/60 = 13/12. The board holds 1/2 + 1/12 - 1/5 - 1/5 + 1/10 - 1/30 = 1/4. Number Board index |