Math concepts
One strong mental image per idea. Concrete, then visual, then abstract.
Discovery
Explorer
Builder
Mental image
Negative numbers
Above and below zero: the elevator and the thermometer.
Explore →Mental image
Percentages & decimals
Discounts and prices: a percent is a fraction of 100.
Explore →Mental image
Decimals
Add, subtract and compare decimals.
Explore →Mental image
Rounding
Round to the nearest ten or hundred.
Explore →Thinker
Mental image
Perimeter & area
Fence the garden: measure the border and the surface.
Explore →Mental image
Coordinates
Find the treasure: points on a map grid.
Explore →Mental image
Powers & roots
Powers, square roots and scientific notation.
Explore →Mental image
Sequences & patterns
Find the rule and continue the sequence.
Explore →Mental image
Angles
Measure, compare and add angles.
Explore →Mental image
Volumes
Fill solid shapes and compute their volume.
Explore →Mental image
Symmetry
Find axes of symmetry in shapes.
Explore →Mental image
Transformations
Translate, rotate and reflect shapes.
Explore →Strategist
Mental image
Algebraic expressions
Simplify and expand expressions.
Explore →Mental image
Linear equations
Keep the balance and solve for x.
Explore →Mental image
Proportions
Scale recipes and compare ratios.
Explore →Mental image
Pythagoras theorem
Find the missing side of a right triangle.
Explore →Mental image
Thales theorem
Use parallel lines to find lengths.
Explore →Mental image
Statistics
Mean, median, mode and range.
Explore →Mental image
Probability
Predict the chances of an event.
Explore →Mental image
Ratios
Share an amount in a given ratio.
Explore →Mastery
Mental image
Functions
A function is a machine: one input, one output.
Explore →Mental image
Linear & affine functions
Slopes, intercepts and graphs.
Explore →Mental image
Inequalities
Solve and read interval solutions.
Explore →Mental image
Systems of equations
Find the point where two lines meet.
Explore →Mental image
Reverse percentages
Find the original price after a discount.
Explore →Advanced
Mental image
Quadratic functions
Parabolas, roots and the vertex.
Explore →Mental image
Trigonometry
Sine, cosine and tangent on the unit circle.
Explore →Mental image
Vectors
Coordinates, sums and lengths of vectors.
Explore →Mental image
Advanced statistics
Quartiles and spread of a data set.
Explore →Mental image
Advanced sequences
Find the nth term of a sequence.
Explore →Mental image
Exponential growth
Powers that grow fast: 2, 4, 8, 16…
Explore →Mental image
Compound probability
Two events in a row.
Explore →Mental image
Composite functions
Feed one function into another.
Explore →Expert
Mental image
Derivatives
The slope of a curve at a point.
Explore →Mental image
Logarithms
Undo powers with logarithms.
Explore →Mental image
Vector dot product
Multiply two vectors to get a number.
Explore →Mental image
Derivative applications
Use derivatives to find slopes and extrema.
Explore →