Maths Warm-Up: Equation Detectives ⭐️ The Sydney Teacher

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Maths Warm-Up: Equation Detectives

I want to share one of those simple, no-prep maths warm-ups from my Monday Morning Maths Club that I often use to get my class thinking straight away from the moment we begin.

Equation Detectives is a fun, no-prep maths activity where students hunt for errors in equations. It’s an easy way to build problem-solving, number sense, and reasoning while keeping your class focused.

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Equation Detectives

Students become “detectives,” working through equations to spot mistakes, justify their thinking, and fix the errors. It’s a fun, problem-solving maths game that builds critical thinking and keeps students engaged as they work things out together.

How It Works

Give your students an equation with a mistake and have them work out what’s wrong. They identify the error, explain their thinking, and then correct the equation to make it true. Add a time limit to keep the pace up and make it more exciting. You can run it individually, in pairs, or in small groups for a bit of friendly competition.

For Example:

Equation: 12 ÷ (3 + 1) × 2 = 10

Student notices the error:

Step 1: Solve inside the parentheses → 3 + 1 = 4

Step 2: Divide → 12 ÷ 4 = 3

Step 3: Multiply → 3 × 2 = 6, not 10

Corrected equation: 12 ÷ (3 + 1) × 2 = 6

Why It's So Good

• Encourages critical thinking and attention to detail

• Builds mental maths, problem-solving, and reasoning skills

• Quick and flexible as it can use addition, subtraction, multiplication, division, or combined operations

• Perfect as a warm-up, bell-ringer, or short group challenge

Turn error-spotting into a fun challenge with Equation Detectives, a free maths warm-up I use to get my class thinking straight away. Give it a go and let me know how it works in your classroom!

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