CalcAnyway · Examples

Examples

"How would you build this calculation?", answered with a board you can actually move.

Every article has a working CalcAnyway board embedded in it. You can change the numbers as you read and check what the text says.

Changes made in the page are not saved. To carry on with your own numbers, press "Open in CalcAnyway" first and edit there — that copy can be saved and shared as a URL.

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Scaling a recipe by the number of people

Study — Move one factor and ten ingredients move with it — except salt and cooking time.

Fractions, from the top

Study — One number, two digits showing. The reduced fraction, the mixed number and the bar diagram all move at once.

Division with a remainder

Study — "divisor × quotient + remainder" and "0 ≤ remainder < divisor". Those two conditions decide the pair.

Rounding a number off

Study — One 34,567, four answers — depending on which place you keep and which method you use.

Area of a figure

Study — Why the triangle is base × height ÷ 2. Drag it and the halving against the parallelogram shows.

Converting units

Study — Multiply or divide? Keep the factor in the formula and the direction stays visible.

Reading data: a line, a histogram and the median

Study — Push one score to an extreme and the mean moves while the median holds.

Per-unit quantities

Study — Speed, density, population density, fuel economy — one amount divided by the amount you measure per.

Concentration of a salt solution

Study — Divide the salt by the whole solution, not by the water. Add water and the denominator alone grows.

Balancing a lever

Study — The heavier side does not always go down. 60 g × 20 cm balances 40 g × 30 cm.

Ohm's law, in series and in parallel

Study — Add a resistor in parallel and the total resistance falls. Why that happens.

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