Maths Error Detectives – Error Analysis & Mathematical Reasoning

Help students strengthen their mathematical reasoning by investigating mistakes, explaining misconceptions and correcting incorrect working.

In Maths Error Detectives, children examine fictional mathematical errors and work through three important questions: What went wrong? Why is it incorrect? How can it be corrected?

Maths Error Detectives Error Analysis & Mathematical Reasoning | UK + US Editions

Help students learn that finding an answer is only part of mathematics.

In Maths Error Detectives, children examine fictional mathematical mistakes, determine what went wrong, explain the misconception, and then correct the working step by step.

Instead of completing page after page of routine calculations, students are encouraged to analyse mathematical thinking, justify their reasoning and communicate why a method is correct or incorrect.

WHAT'S INCLUDED

• 46 pages in each edition

• 80+ Error Detective cases

• 3 difficulty ranks

• Foundation, Developing and Reasoning practice

• Place value

• Addition and subtraction

• Multiplication and division

• Rounding and number lines

• Fractions and equivalent fractions

• Fractions of quantities

• Decimals

• Money

• Time

• Measurement

• Perimeter and area

• Angles and shape properties

• Multi-step problems

• Mixed mathematical reasoning

• Create-the-Mistake activity

• Final Challenge Board

• Full worked solutions

• UK and US editions included

HOW IT WORKS

Students are encouraged to think like maths detectives:

1. Spot the Error — Look carefully at the claim or working.

2. Explain the Mistake — Identify the mathematical misconception.

3. Correct the Working — Show a mathematically correct method.

4. Justify the Answer — Explain why the corrected reasoning works.

This structure gives children practice in reasoning about mathematics rather than relying only on whether their final number matches an answer key.

FULL WORKED SOLUTIONS INCLUDED

The solution section does more than provide final answers.

Each fixed-answer case includes:

THE CLAIM → WHAT WENT WRONG → CORRECT WORKING → CORRECT ANSWER

This allows teachers, parents and students to see exactly how the mistake should be corrected and makes the resource useful for independent review, intervention and reteaching as well as classroom practice.

THREE DIFFICULTY RANKS

Cases progress through three levels so teachers can select activities appropriate to individual learners.

FOUNDATION

Core concepts and common misconceptions.

DEVELOPING

More involved calculations and mathematical connections.

REASONING

Multi-step thinking, explanation and deeper error analysis.

TWO LOCALISED EDITIONS INCLUDED

This download contains both editions.

UK EDITION

Uses UK mathematical language, spelling, pounds and pence, metric measurements, Maths, pupils, trapezium and other appropriate UK terminology.

US EDITION

Uses US mathematical language, spelling, dollars and cents, U.S. customary measurement where appropriate, Math, students, trapezoid and other appropriate US terminology.

The mathematics has been carefully adapted rather than simply changing the spelling on the cover.

IDEAL FOR

Math centres • independent practice • small groups • intervention • reteaching • morning work • early finishers • homework • assessment review • test preparation • partner discussion • mathematical reasoning practice

TERMS OF USE
This resource is for personal, homeschool, classroom and single educator use only.
You may not resell, redistribute, share, upload, copy or claim this resource as your own.

Thank you for supporting KOJI PATH.

© KOJI PATH