Develop mathematical reasoning and problem-solving skills with these 40 ready-to-use KS1 Maths Spot the Mistake tasks, featuring illustrated challenge cards, an editable PowerPoint, a matching printable PDF and complete teacher answers.

Designed for Year 1 and Year 2 (ages 5–7), this resource encourages pupils to identify mathematical errors, correct them and explain their reasoning.

Each challenge follows a simple three-step approach: Spot It – Fix It – Explain It, helping children develop confidence in recognising misconceptions and justifying their answers.

What’s Included?

40 numbered maths reasoning tasks across five sections:

• Number & Place Value (Tasks 1–8): place value, number representations, counting and tens and ones
• Addition & Subtraction (Tasks 9–16): calculation errors, number lines, missing numbers and inverse operations
• Patterns, Sequences & Comparison (Tasks 17–24): number patterns, ordering, comparison, odd and even numbers
• Measurement & Fractions (Tasks 25–32): length, mass, capacity, time and simple fractions
• Shape & Mixed Reasoning (Tasks 33–40): shape properties, positional language, equal groups, arrays and money

Also included:

• Teacher Answer & Reasoning Guide covering all 40 tasks, with corrections and suggested mathematical explanations
• Quick Start Guide with simple instructions for using the challenges
• How to Use Guide with suggestions for whole-class discussion, partner work, small groups and independent activities
• Maths Reasoning Prompts to encourage children to explain and check their thinking
• Two challenge cards per slide or PDF page, with space for pupils to record their answers

Ideal For

KS1 maths lessons, reasoning practice, lesson starters, morning work, identifying misconceptions, paired discussions, small-group intervention and independent challenges.

Tasks can be displayed on screen or printed for individual and group use.

Files Included

• Editable 29-slide PowerPoint (.pptx) in A4 landscape format
• Matching 29-page A4 landscape PDF (.pdf) for printing

The PDF is a copy of the PowerPoint presentation. Both formats include all 40 tasks, teacher guidance, reasoning prompts and complete answers.

KS1 | Years 1–2 | Ages 5–7