2. Adding and Subtracting Fractions

Remember to read the instructions for each activity as you work through them. Also don’t forget to ask for help as you need it!

Before attempting this section, you should feel confident in:

After completing this unit, you should be able to confidently:

  • add and subtract fractions with common (the same) denominator
  • add and subtract fractions with different denominators
Introduction / Tuning In
Why do we need to use fractions? (V) (E)
Watch this video to see why we need to learn fractions.

Open Ended Task – Fractions (W)
Use a fraction wall or modelling materials (fraction pizzas etc) to come up with as many answers as possible to this question. Record your answers somewhere.

fractoeWhat numbers could go in the blanks? Think of answers with different denominators!

Activities Adding and Subtracting Fractions
Adding and Subtracting Fractions – Teaching Unit (U) (W)
This unit on the Ultranet contains examples, instructions and tasks abut how to add and subtract fractions, starting with the basics
Video Explanation: How to add and subtract fractions (V)
This demonstration video shows you the steps for adding and subtracting fractions.

Action Fractions (G)(W)
Practice adding and subtracting fractions with the same and different denominators using this racing game.

Fraction Wall (E)
Use the Fraction Wall tool to model different fractional amounts.

Conclusion Problems with Fractions (W)
Check out this recipe for Pineapple Upside Down Cake from the SAKG blog. Use it to answer these questions.

  1. How many cups will I fill when I combine the brown sugar, self raising flour and caster sugar?
  2. If I was to make 5 cakes, how many cups of self raising flour would I need?
  3. I have 8 cups worth of caster sugar. If I bake 3 cakes, how much caster sugar is left?
  4. My bag of self raising flour contains 12 cups worth of sugar. How much will be left after cooking 7 cakes?

Mathletics (M) (G)
Complete the following Mathletics Tasks. Remember to use the big ? button on the side if you need help!

  • Fractions – Simplify and Equivalent > Lowest Common Multiple
  • Fractions – Add and Subtract > Add: Common Denominator
  • Fractions – Add and Subtract > Add: No Common Denominator
  • Fractions – Add and Subtract > Mixed Number

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