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