The addition and subtraction of fractions

4. Add these fractions directly.

These fractions have the same denominator, finding its addition is easy.
 - Type its numerator first, then type its denominator, and when you hit Enter again you will be shown if it is CORRECT or WRONG.
This activitiy doesn't allow any corrections.
- When you click on Init another fraction will appear. Do this activity several times.


  Eduardo Barbero Corral
Spanish Ministry of Education. Year 2007

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