D00-F01 foundation lab

Ratios, Proportions, Rates, and Percentages

Change the base or the amount and notice how the same money can tell a different story. This is a tiny synthetic example. It is not a market calculator.

1. Choose a teaching case

Canonical
Evidence trace

2. Choose the numbers

Four-step lesson pathInput, rule, check, and meaning. InputRuleCheckMeaning 1
Stage 1 · name the input

Ready

Start with the numbers and press Step. The lab will reveal one small idea at a time.

Remember: a calculation can be correct and still be the wrong calculation for a real decision. Keep the unit, time period, and boundary with the answer.