| Measure | Value |
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Problems are randomly generated with realistic teaching values. The worked solution builds step by step after a correct answer or when you ask for it, and ends with a common mistake to avoid.
Your job
Drag a card onto a box, or tap a card and then tap the box's name. Cards are buttons, so Tab and Enter work too.
Graphs use rounded values shaped like published data; read them for trends, not exact counts.
Wrong picks are fine here. Each one tells you why.