305 levels across 11 categories. Pick a skill, finish a short workout, and review the method when a question goes wrong.
Addition
Left-to-right addition from 1-digit pairs to 4-digit mastery.
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Subtraction
Borrow-aware subtraction from 1-digit basics to 4-digit answers.
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Multiplication
Core multiplication from 1x1 facts to 4x4 digit products.
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Division
Exact-integer division with divisor bands from 1-digit up to 99.
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Squares
Duplex drills, then 2-digit through 4-digit square practice.
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Percentages
Percent-of-number drills from 1-digit warmups to 2-digit percent of 3-digit values.
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Specific Tricks
Thirty shortcut drills: x11, complements, near-base, round-correct, x5, x25, x50, and x125.
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Fun / Mixed
Multi-operator BODMAS expressions with signs, from 1-digit to 4-digit mastery.
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Number Theory
Prime testing, GCD, LCM, and divisibility rules from 2 through 12.
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Determinants
Mental 2x2 and 3x3 determinants for Cramer's rule and linear systems.
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Equations & Systems
Linear equations and 2-variable / 3-variable systems solved by Cramer's rule.
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