Maths Code Breaker | LKS2 | Years 3 & 4

A maths code breaker for Years 3 and 4, built around cracking codes using mental and written calculation across all four operations. This is perfect as a one-off lesson at the end of term or end of year, or for a cover lesson.

Pupils work through a sequence of clues to unlock three padlock codes before tackling a final code using formal written methods, times tables and related division facts.

Three levels of differentiation run throughout, making it workable across mixed-ability classes without additional preparation.

The resource opens with a PowerPoint warm-up, a practice code breaker and a spot-the-mistake task. There are three challenges available for children who finish early.

What’s included:

• PowerPoint with warm-up activity, practice code breaker and spot-the-mistake task
• Code breaker activity sheet with three levels of differentiation:

• Level 1: addition and subtraction with 1, 2 and 3-digit numbers; 2, 5 and 10 times tables
• Level 2: addition and subtraction up to 3-digit numbers; 2, 3, 4, 5, 8 and 10 times tables and related division facts
• Level 3: addition and subtraction with up to 4-digit numbers; mixed times tables and related division facts; formal written methods for multiplication and division

Three differentiated challenges (for early finishers or children who need an extra challenge):

Challenge 1: spot the mistakes in 3-digit addition and subtraction problems
Challenge 2: solve a maths story, working through problems along the way
Challenge 3: solve a range of clues to complete a mystery keypad

Answers included

A self-contained LKS2 maths code breaker lesson - structured, differentiated and ready to run.