Aimed at Years 3 and 4, students need to solve addition and subtraction code breaker problems using formal written methods in order to crack the Christmas themed codes. This resource includes:
- A PPT with a quick warm up, a practise code breaker and a missing number addition problem.
- Code breaker activity with three levels of differentiation:
– Addition and subtraction with 2 and 3 digit numbers involving some carrying for addition and no exchanging for subtraction.
– Addition and subtraction with 3 digit numbers involving carrying for addition and exchanging for subtraction.
– Addition and subtraction with up to 4 digit numbers involving carrying for addition and exchanging for subtraction.
- Challenges with three levels of differentiation, challenges 1 and 2 involve missing number calculations. Challenge 3 involves word problems using different words to mean addition and subtraction.
