24 Game: Single Digits , Double Digits , Add/Subtract Primer, Multiply/Divide Primer, Fractions/Decimals, and Algebra/Exponents

MathGrades 1–12

About This Curriculum

A math card game where players use four numbers and basic operations to make 24, designed to improve mental math skills and critical thinking.

What makes it unique: Time-tested math teaching tool that has been successfully engaging students for over 30 years, with multiple difficulty levels and versions covering elementary through algebra concepts

24 Game: Mental Math Card Game Series Across All Grade Levels

The 24 Game is a series of math card games where players use four given numbers and basic operations to make 24, spanning six editions from basic addition through algebra. This mental math game emphasizes procedural fluency and critical thinking through engaging gameplay rather than traditional worksheet practice.

Best for

Teachers and homeschool families seeking an engaging mental math supplement for grades 1-12, particularly effective for building procedural fluency and number sense through game-based practice

Evaluation Criteria

2 strengths · 4 concerns · 1 neutral · 2 insufficient evidence

Retrieval PracticeStrength

The game naturally incorporates extensive retrieval practice through repeated mental calculation and fact recall during gameplay.

Reviews emphasize the 'amount of mental math that takes place' and use as regular 'warm-ups throughout the year,' providing ongoing retrieval practice

Sequencing ApproachStrength

Uses a clear mastery-based progression with multiple difficulty levels within each edition and across the series from basic operations to advanced algebra.

Cards are 'divided into three groups, from easy to difficult' and the series progresses systematically from Single Digits through Algebra/Exponents with Primer editions for easier access

Word ProblemsConcern

No evidence of word problem instruction or real-world application beyond basic number manipulation.

Reviews focus entirely on using 'four numbers using addition, subtraction, multiplication, and division' without mention of word problems or application contexts

Worked ExamplesConcern

Limited evidence of worked examples, though some editions include 'hints for common patterns' to support learning.

Only the Algebra/Exponents edition is mentioned as having 'hints for common patterns' to help students, with no indication of step-by-step modeling in other editions

Direct InstructionConcern

The game format does not facilitate direct instruction, relying instead on discovery and practice through gameplay.

Teachers use it as 'warm-ups' or independent activities, and homeschool parents note children 'took to the game quickly' without mention of explicit instruction components

Conceptual Procedural BalanceConcern

The game heavily emphasizes procedural fluency and mental calculation skills but provides limited explicit conceptual development.

Reviews highlight 'mental math that takes place' and 'mental calculation skills that transfer to real-world number usage,' but don't mention conceptual explanations or understanding-building features

Assessment DiagnosticNeutral

The game provides informal assessment opportunities through observation but lacks formal diagnostic tools.

Teachers can observe student thinking and 'valuable discussions about order of operations' emerge, but reviews mention no systematic assessment features

Teacher TrainingInsufficient Evidence

No evidence of teacher training materials or pedagogical guidance beyond basic game rules.

Reviews mention the game's popularity and tournament play but provide no indication of teacher support materials or professional development resources

Visual RepresentationsInsufficient Evidence

No evidence of visual models or manipulatives beyond the number cards themselves.

Reviews describe only '4x4 double-sided cards' with numbers but mention no visual representations, diagrams, or concrete-to-abstract progression tools

Sources: cathyduffyreviews.com, guavarama.com