Rusty on math?
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Back to Basics
Number bonds, borrowing, fractions and more, explained in different ways.
+
Addition
Number bonds, make 10
−
Subtraction
Count up, borrow zeros
×
Multiplication
Quick estimates & shortcuts
÷
Division
Halving & number bonds
%
Percentages
Build from 10%, flip it
½
Fractions & Decimals
Benchmarks & fraction of n
∶
Ratios
Draw parts, shared totals
√
Squares & Roots
Nearby squares & roots
x
Algebra
Undo operations, isolate x
θ
Trigonometry
SOH CAH TOA, special angles
◬
Geometry
Formulas, triples, composite
⇄
Unit Conversions
Metric ladder & imperial