1. Year 5 Fractions Lesson 4 Subtracting mixed numbers with re-grouping Mastery Specilaists Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith

2. Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith
Review:
Subtract the wholes
Subtract the parts
3a. Are the denominators the same?
3b. USE EQUIVALENCE TO MAKE THE DENOMINATORS THE SAME
4. Subtract the numerators. 2
Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith

3. Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith
Review: 1
Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith

4. Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith
Pose the problem:
Chen has started to complete this calculation, but is stuck…. 1
What advice would you give to Chen?
Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith

5. Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith
Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith

6. Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith
New learning
Chen could also re-group first…
We can see we don’t have enough parts, so we can re-group…
Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith

7. Practise re-grouping…
Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith

8. Practise re-grouping…
Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith

9. Which strategy will you choose?
1. Subtract whole numbers
then make an improper fraction to subtract the parts
2. Re-group then subtract whole numbers and parts
Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith

10. Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith
Task:
Sort the calculations – which ones need to be re-grouped in order to subtract?
Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith

11. Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith
Challenge:
Amy Stokell, Natalie Ruddell, Valda Varadinek-Skelton, Vicky Smith