Addition of fractions

1. Choose your fractions by inputting numbers into the four boxes. Each fraction should be less than 1[br]2. The fractions are represented by partly filled boxes below[br]3. Drag the Add slider to push the boxes together.[br][i]Can you count the boxes to work out the fraction sum?[br]Do you know what the LCM (Lowest common denominator) of the two denominators (bottom halves) are?[br][/i]4. Select the LCM check box.[br][i]Drag the Add slider again - can you work out the fraction sum now?[/i][br]

Information: Addition of fractions