With the digits 1 up to 9, you must make 100, using the following rules:

• Each digit must be used exactly once.
• The only allowed operation is addition.
• Two single digits may be combined to form a number (so, for example, 2 and 4 may be combined to 24 or 42).
• Two single digits may be combined to form a fraction (so, for example, 2 and 4 may be combined to ²⁄₄ or ⁴⁄₂).

The question: How can this be done?

The solution: Click here!