| Measure | Value |
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Problems are randomly generated with realistic teaching values. For "predict then watch" items, make your prediction first; the picture then plays out what happens. Worked solutions build step by step, and units that cancel are struck through in red.
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.
Teaching data with rounded values, modelled on published patterns. Not medical advice.
Wrong picks are fine here. Each one tells you why.