Hit the apple

Demonstrate the learning object L2804 Fraction fiddle: hit the apple  to the class and discuss the dynamically linked components.

  • One denominator is fixed but the other denominator and both numerators can be adjusted to create the desired fractions.
  • As the fractions change, their fraction bars also change, as does their total on the vertical number line.
The addition of 1/6 and 5/6 to reach the target of 1, shown with fraction bars and a number line.

A screen grab from L2804 Fraction fiddle: hit the apple.
Source: © Education Services Australia Ltd, 2011 

Demonstrate a task with these steps.

  • Make the second denominator the same as the first.
  • Make a fraction less than 1 and ask the students to suggest what the other fraction must be to complete one whole.
  • Select <Repeat> and find another pair of fractions to complete the task. Selecting <Next> will specify a different denominator to work with.

Pairs of students work together on computers, taking turns to complete an addition task. Ask students:

  • to print out the record sheet and discuss the patterns they see in the numbers
  • what strategies they would use to add fractions like these without the learning object to assist.

Students ready for a greater challenge can be encouraged to make a different denominator for the second fraction.

Curriculum links

Year 5: Investigate strategies to solve problems involving addition and subtraction of fractions with the same denominator