Proportional ReasoningATI TEAS 7 cheat sheet

Scaling up and down

5 key facts Reviewed Oct 2026

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Set It Up

Write a proportion with matching units on each level
Cross-multiply and solve

Recipes & Doses

Scale every ingredient by the same factor

Maps & Models

Scale 1:50 means 1 unit on the model is 50 in reality

Check

Does the answer move in the direction you expect — bigger or smaller?

Key takeaway

Scaling up and down

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