Digit Matrix : Math Puzzles 3.1

振华许 – Freeware – iOS
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Digit Matrix offers an engaging array of mathematical exercises designed to enhance calculation skills, logical reasoning, and overall mathematical thinking. This application caters to a wide range of skill levels, from the beginner to the highly advanced, making it a valuable resource for both learning mathematics and mental training. Below is a detailed overview of its features and exercises.

Features:
<ul>
 <li>Computation and Logical Reasoning</li>
 <li>Fifteen distinct types of exercises with infinite variations</li>
 <li>Variety in difficulty levels</li>
 <li>User-friendly interface for easy onboarding</li>
 <li>Five distinct themes for engagement</li>
</ul>

Contents:
<ol>
 <li>Arithmetic Square: Arrange the numbers 1 to 9 in designated cells to satisfy given equations, evaluated from left-to-right and top-to-bottom while disregarding standard operator precedence.</li>
 <li>Chains: Fill the squares from 1 to X, ensuring that each equation connecting two squares is accurate. Each square must contain a unique number.</li>
 <li>SUMS: Populate the grid with numbers from 1 to N, guaranteeing each cell holds a different value. The numbers outside the grid indicate the sums for corresponding rows, columns, or diagonals.</li>
 <li>Coins: Distribute coins in every cell so that their sums in rows and columns align with specified values; note that denominations may be repeated within each row or column.</li>
 <li>Hundred: Complete a square grid with digits such that addition of each row and column totals 100.</li>
 <li>Antimagic Square: Position numbers from 1 to 2*N in the grid while ensuring each row, column, and main diagonal contains exactly two numbers, with their sums noted around the grid.</li>
 <li>Products: Assign numbers from 1 to 2*N into cells under the constraint that each row and column includes exactly two numbers, with specified products indicated outside the grid.</li>
 <li>Products (Off-by-One): Similar to Products but allowing for an adjustment of +1 or -1 from the actual product for the external clues relating to rows and columns.</li>
 <li>Addends: Choose a specified number of unique values from a set where their collective sum matches a provided target.</li>
 <li>Equality: Remove a defined number of squares so that the remaining cells correctly compose an equation while respecting conventional order of operations.</li>
 <li>Alphametic Square: Determine which digits correspond to letters such that all equations remain true. Notably, multi-digit numbers cannot begin with zero.</li>
 <li>Matches Arithmetic: Manipulate matchsticks—removing, adding, or moving—to establish a valid arithmetic equality through click-and-drag actions.</li>
 <li>Digit Twins: Link two numbers through line segments based on their greatest common divisor; eliminate any number yielding a quotient of one while targeting board-wide elimination.</li>
 <li>Divisor and Multiple: Alternate addition of numbers into two queues; eliminate any number if it shares a greatest common divisor yielding one with its counterpart during divisions.</li>
 <li>Numeric Factor Path: If adjacent numbers share a common divisor greater than one, they can be connected with one line. The goal is to form non-intersecting paths among all numbers on the board.</li>
</ol>

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