Skip to content
Oak National Academy
Oak National Academy
Teachers
Pupils
arrow-left
Change unit
subject-maths

Extending calculation strategies and additive reasoning

Year 6 • Maths
We've put the lessons in order helping you build on what you've learned before so it’s best to start with the first lesson of a unit.

Choose a lesson (30)

warning

Some of these lessons will soon be taken down.

We've made brand new and improved lessons for you.
Read the help article
chevron-right
1
Adjusting addends
chevron-right
2
Same sum' with larger numbers
chevron-right
3
Same sum' with decimals
chevron-right
4
Balancing equations using the 'same sum' strategy
chevron-right
5
Balancing equations using compensation
chevron-right
6
Balancing equations: Does the order of addends matter?
chevron-right
7
Increasing an addend
chevron-right
8
Decreasing an addend
chevron-right
9
Solve calculations mentally by relating them to known facts
chevron-right
10
Find an unknown addend
chevron-right
11
Introduction to same difference
chevron-right
12
Same difference in context
chevron-right
13
Use the Language of Minuend, Subtrahend, and Difference
chevron-right
14
Transform calculations using the same difference
chevron-right
15
Practice: Transforming Calculations to Make Them Easier to Solve Mentally
chevron-right
16
Transform a subtraction calculation to make the written algorithm easier to apply
chevron-right
17
Practice: 'Same Difference' in Different Contexts
chevron-right
18
Balancing equations to find unknown values
chevron-right
19
Explore how the difference changes when only the Minuend is changed
chevron-right
20
Apply the generalisation about how the minuend and difference change to solve problems
chevron-right
21
Explore how the generalisation can be used as a mental calculation strategy using Known facts
chevron-right
22
Thinking flexibly
chevron-right
23
Comparing Strategies
chevron-right
24
The more we subtract, the less we are left with. The less we subtract...
chevron-right
25
Contexts where the Minuend is Kept the Same, and the Subtrahend Increases
chevron-right
26
Contexts where the minuend is kept the same, and the Subtrahend decreases
chevron-right
27
Further practice to reason about how the change in the subtrahend changes the difference
chevron-right
28
Explore problems in which the new difference must be found
chevron-right
29
Balance Equations Where the Compensation Property of Same Sum Cannot Efficiently be Applied
chevron-right
30
Balance Equations Where the Compensation Property of Same Difference Cannot Efficiently be Applied
chevron-right