Store, browse, share, and remix cards: the building blocks of every lesson.
How far up the levels can you climb?
How far can you get before a problem stops you?
Students drag five markers (min, Q1, median, Q3, max) and the box plot redraws around them live. Checks the five-number summary of a real data set.
Students drag paired bars up and down to represent a two-group data table. Checks every bar against the data.
Watch a two-step equation solve itself, one move at a time.
The data is names, not numbers. Students choose between a bar graph, a pie chart and a pictograph, and learn that the right answer depends on whether shares of a whole or a young audience matter. From Sean's display-choice bank.
The data is numbers. Students choose between a dot plot, a stem-and-leaf plot, a histogram and a box plot, weighing how many observations there are and whether groups are being compared. From Sean's display-choice bank.
Students simplify a polynomial by combining coefficients themselves, term family by term family. Rebuilt from Sean's slider-scrubbed worked example, made active.
Sean's step-by-step distributive-property solver, running live in Glyph.
Build a data set and locate its middle, step by step.
A data table has a blank; students type the value that makes a target statistic true, with the live statistic shown. From Sean's Mean question bank.
A gray target parabola is drawn; students drag the vertex and one more point, and their fitted curve redraws live until it matches. From Sean's graphing tool.
A whole strip spans the board; students drag markers to unit fractions, discover equivalence, and compare sizes by position. Rebuilt from Sean's fraction-strip manipulative with checkable targets.
Students drag a boundary point and a shading marker to graph one-variable inequalities, presented one at a time. Checks placement and direction.
A worked problem the student completes themselves: place the given numbers into the setup, then fill each derivation line. Show Me help is available, and logged. Straight from the WeDo percent prototype.
Students adjust a shape's dimensions with sliders to hit a target area or volume shown live, Sean's 'choose the radius closest to 500 cm³' question class, made hands-on.
Students see the first three figures of a growing pattern and work out the count for a figure too big to draw. Three patterns, linear then square then triangular, so the same question needs a different kind of thinking each time. From Sean's visual pattern practice.
Adding integers on the number line: each +1/−1 pair cancels to zero. Students drag to the result and count the canceling pairs. Completed from Sean's chip-model prototype, which had the manipulative but no targets.
Students judge membership and subset statements written in symbols, dragging TRUE or FALSE. The point Sean's page makes: an element belongs to a set, a set is contained in a set, and swapping the symbols changes what is being claimed.
A mini 10-Question-Challenge: five steps that climb Sean's levels from Recognize to Discover. Each answer is generated, never selected, type or manipulate, then check.
Students type a number into an input box and an angle arm swings to match, live. Checks target angles including reasoning steps (supplementary, etc.).
Students sweep a ray to build target angles, then read the same ray against the opposite baseline, a protractor has two scales, and the baseline decides the reading. From Sean's protractor pair.
A mystery curve is drawn in gray; students tune a slider until their curve matches it. Checks the parameter. Works for parabolas, exponentials, and more.
Students drag data points on a number line and watch the mean move live, then hit target means. Builds the balance-point insight from Sean's Mean progression.
Sum, divisor, product, prime, GCF, LCM: students prove they know each term by typing the number it names. Rebuilt from Sean's self-graded flashcards with real checking.
A guided derivation where the student computes every stage themselves, parentheses, exponents, multiplication, addition. Rebuilt from Sean's three walkthrough variants, made active instead of click-to-reveal.
Students decide whether a reported number describes a whole population or a sample drawn from it, dragging into one of two zones. Sean pairs his examples so the same context appears both ways, which is what makes the distinction bite.
Multi-digit multiplication the box-model way: students decompose by place value, compute every partial product, and sum. Rebuilt from Sean's staged typed worksheet.
A worked problem the student completes themselves: place the given numbers into the setup, then fill each derivation line. Show Me help is available — and logged. Straight from the WeDo percent prototype.
Students drag points onto a given linear function to show they can read a rule as coordinates. Checks each point against the equation.
Degree and leading-coefficient sliders drive a live power function; students produce each of the four end-behavior cases on demand. Consolidates Sean's three end-behavior builds.
Students grow a factor tree by always extracting the smallest prime, then assemble the prime factorization with exponents. Rebuilt from Sean's clickable SVG tree.
Students grow a circle with a radius slider and watch C = 2πr update live, then hit a target circumference and compute one by hand. From Sean's circle explorations.
Students separate bias that happens when the sample is CHOSEN from bias that happens when the data is COLLECTED, dragging each scenario into one of two zones. The first half of Sean's bias work, and the distinction the eight named types hang on.
Students set sliders for m and b to make y = mx + b pass through given points. The equation label updates live.
Students solve x + p = q and px = q where coefficients and solutions run negative. Identical skill to the whole-numbers variant, the number domain is the only thing that moved.
Students solve x + p = q and px = q by typing the value of x. Non-negative whole numbers only, the entry point before integers arrive. Same skill with integers: see the Integers variant.
Work each step yourself, or skip and watch.
Students classify questions by dragging a marker into the STATISTICAL or NOT zone; the feedback explains the why (group variability vs. individual fact). From Sean's drag-sort with its rationale intact.
Students set sliders for the coefficients of an equation (including negative values) so it has a required solution, Sean's working-backwards questions made manipulable. The solution readout updates live. Grade 7+: coefficients range negative, above grade-6 scope.
Four zones in a meaningful grid: categorical on the left (nominal, ordinal), quantitative on the right (discrete, continuous). Students place each variable, so the two big decisions happen in one gesture. From Sean's 48-variable bank.
The other half: the sample may be fine, but the answers are pushed off true. Students name response bias, question wording, interviewer effect, or a faulty instrument. Scenarios and explanations are Sean's.
Once students know the bias came from HOW the sample was chosen, they name which of the four selection biases it is: undercoverage, convenience, voluntary response, or nonresponse. Scenarios and explanations are Sean's.
Two overlapping sets, four regions. Students drag a marker into the region a set expression describes, one expression at a time, including the complement and the difference. From Sean's clickable double Venn diagram.
Three overlapping sets and eight regions, where the same expressions get genuinely harder: the centre is in all three, and a two-set intersection now has to EXCLUDE the third. From Sean's triple Venn highlighter.
Six methods in a three-by-two grid: simple random, systematic, stratified, cluster, convenience and voluntary response. Students read how the sample was drawn and place it. Sean's scenarios, hints and explanations throughout.
The harder half: not a count, but the rule itself. Students fill in the coefficient and the constant for the nth figure, then test it against a figure they can still see. From Sean's nth-term pattern practice.
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