## Adding and Subtracting Fractions## Use the sliders below to perform addition and subtraction of fractions
Megan Yanes, Created with GeoGebra |
Move the red sliders to show 1/2. Move the blue sliders to show 2/5. Now move the blue point to the left so that the two squares coincide. 1. How many of the small congruent rectangles are red? (Hint: the purple ones count too) 2. How many are blue? (Same hint as above) 3. How many are there total? (Shaded and unshaded) 4. How do the answers to questions 1-3 relate to the sum of these two fractions? 5. How many red, non-purple rectangles are there? 6. How many blue, non-purple rectangles are there? 7. How do the answers to questions 6 and 7 relate to the difference of these two fractions? 8. Come up with a rule for adding fractions and a rule for subtracting tfractions using this tool. |